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INTEGRAL
?INTEGRAL TAK TENTU
?INTEGRAL TERTENTU
INTEGRAL TAK TENTU




     CONTOH :
 1.¡Ò 3 dx = 3x + c
  2.¡Ò 5 dt = 5t + c
 3.¡Ò 8 dQ = 8Q + c
4.¡Ò 56 du = 56 u + c
2. ¡Ò ax b dx = a x b+1 + c
                     b+1



CONTOH :
1.¡Ò 4X3 dx = 4 x 4 + c = x4 + c
            4

2. ¡Ò 3x8 dx = 3 x 9 + c =1/3X9 + C
              9
3. ¡Ò aUb dU = a U b+1 + c
                                 b+1      U=f(x)


CONTOH :
1. ¡Ò (2X+ 1)dx = ¡­                   2. ¡Ò (4X + 4) dX = ¡­               -1
      X2 + X                            (4X2+8X+6)3              4 (4x2+8x+6)2
Jawab :                            jawab :
Misal : U = X2 + X                    Misal : U =4X2+8X+6
       dU =( 2X + 1)dX                       dU =(8X+8)dX
   ¡Ò (2X + 1)dx = ¡Ò dU                       dU =2(4X+4)dX
       X2 + X        U                       dU =(4X+4)dX
               = Ln U + C                     2
               = Ln ( X2 + X ) + C        ¡Ò dU = ¡Ò ? U -3 dU
                                            2U3
                                             =   ?.1/-2 .U-2 + C
                                            = - ?(4X2+8X+6) -2   + C
4.¡ÒUdV = U.V - ¡ÒVdU
                RUMUS DI ATAS ADALAH
CONTOH :        RUMUS INTEGRAL PARSIAL
¡ÒX.eX dx = ¡­.
Misal : U = X
        du = dx
         dv = eX dx
           V=¡ÒeX dX = eX + C
¡ÒX.eX dx = U.V - ¡ÒV dU
           = X.eX - ¡Ò eX dx
           = X.eX - eX + C
5.¡Ò ex dx = ex + c




6.¡Ò[f(x) + g(x)] dx =¡Ò f(x)dx+¡Òg(x)dx




      7.¡Òn.f(x)dx = n¡Òf(x)dx
SOAL
SELESAIKANLAH !
1. ¡Ò X3 dX = ¡­       6. ¡Ò ¡Ì 2 + 5X dX = ¡­
2.   ¡ÒX -4 dX = ¡­ 7.¡Ò (X2 + 3X + 4)3(2X + 3)dx =¡­
3.   ¡Ò9X2 dX = ¡­ 8. ¡Ò X2 + 3X ¨C 2 dX = ¡­
4.   ¡Ò5/X dX = ¡­                X
5.   ¡Ò(X2 -¡ÌX + 4) dX = ¡­      9. ¡ÒX.e  x? dX = ¡­
INTEGRAL TERTENTU
UNTUK a < c < b,berlaku
  b                  b                          b               b
1.¡Ò f(x) dx = [F(X)] = F(b)- F(a)           4. ¡Ò k f(x) dx =k ¡Ò f(x) dx
 a                   a                        a               a
   a                                  b                    b          b
 2.¡Ò f(x) dx = 0                  5. ¡Ò [f(x) + g(x)]dx = ¡Òf(x)dx + ¡Òg(x)dx
   a                               a                      a          a
  b             a                   c           b           b
3.¡Ò f(x) dx = - ¡Ò f(x) dx       6. ¡Òf(x)dx + ¡Òf(x)dx = ¡Ò f(x)dx
  a             b                 a          c            a
SOAL
   6                          0
1.¡Ò X dX = ¡­.              5. ¡Ò (X2 ¨C 2X + 3) dX = ¡­
 4                          3
    3                             3
2. ¡Ò (X2 ¨C 2X + 3 ) dX = ¡­    6. ¡Ò (2X + 1)(3 ¨C X) dX = ¡­
  0                             1
    1                            4
3. ¡Ò (2X + 5) dX = ¡­         7. ¡Ò ( ¡Ì X ¨C X )2 dX = ¡­
 -1                            1
    -4                               8
4. ¡Ò (3X2 + 2X) dX = ¡­           8. ¡Ò (X1/3 ¨C X-1/3) dX = ¡­..
  -6                              1
     2                              2a
9. ¡Ò (X + 9X3) dX = ¡­           10. ¡Ò (a + X ) dX = ¡­
 1                                  a
BY
AMIRULSYAH,MSi
SURPLUS KONSUMEN


           Fungsi demand                    Fungsi demand
                                       SK
     SK
     SK
P1

                           Q                            Q
 O        Q1                   O




 P                                 P
SURPLUS PRODUSEN
     P                             P



         SP                   P1                 Fungsi supply
                                       SP
P1            Fungsi supply
                       Q                                 Q
O               Q1            O             Q1
P                                      P
              Fungsi demand



         SK                                     SK
                   Fungsi supply
                                   P1
P1
     SP                                         SP
                      Q
 O            Q1
                                   O
                                                          Q
                                        0            Q1
PENGETAHUAN DASAR
LUAS DAERAH
      Y                       CARA I : L= axt
                                           2
  5                                    L= 4x3
              LUAS = ¡­?                    2
                                       L= 6 satuan luas
  2
                          X   CARA II : Integral
  O          4                  4
                              L= ¡Ò(5-3/4x)dx ¨C 2x4
  CARA III: INTEGRAL             0
       5                                        4
  L=¡Ò(
     2
             ) dy                             ?
                              = (5X ¨C ?.1/2X )] - 8
                                                 0
  Y= 5-3/4x
                              = (5.4 ¨C 3/8.16) ¨C (5.0-1/4.0) ¨C 8
  X= 20/3 ¨C 4y
                              = (20 ¨C 6) ¨C 0 ¨C 8
        5
                              = 14 - 8
  L = ¡Ò (20/3 ¨C 4/3Y)dy
                              = 6 satuan luas
     2
  L= 6 satuan luas
LUAS DAERAH
      P
    6                                  CARA I: INTEGRAL
                                          5
        LUAS
                   P= 6 ¨C 3/25 Q   ?   L=¡Ò ( 6 ¨C 3/25Q?)dQ ¨C 3x5
    3
                                         0                 5
    0                  Q
               5
                                       L = (6Q ¨C 3/25.1/3Q?)] ¨C 15
                                                           0
                                       L = 10 satuan luas
         CARA II: INTEGRAL
           6
         L=¡Ò   (50 ¨C 25/3P)1/2 dP
           3                                    6
         L = { 2/3(50 ¨C 25/3P)3/2.(-3/25)} ]
                                          3
         L = { - 2/5 (50 ¨C 25/3P)3/2
         L = 10 satuan luas
P
             LUAS= ¡­?
                         2
                     P 2 Q
    6                    3       CARA II : INTEGRAL
                                           6
    2                                     ¡Ò
                                 L = 6X6 - (2 + 2/3Q)dQ
                     Q                  0                    6
        0
               6
                                         {
                                 L = 36 ¨C 2Q + 2/3.1/2Q?   }]
                                                            0
CARA I : RUMUS                   L = 36 ¨C 24 = 12 satuan luas
L = axt
     2                   CARA III : integral
L= 4x6                     6
       2                     ¡Ò
                         L = ( 3/2 P ¨C 3 ) dP
L = 12 satuan luas          2              6
                         L = ( 3/4P ¨C 3P )    ] = 9 + 3 = 12 satuan luas
                                              2
LUAS DAERAH
    P

                     P = 2 + 1/5Q?
7                                    CARA I : INTEGRAL
        LUAS                                  5
2                                    L = 7x5 - ¡Ò( 2 + 1/5Q?)dQ
                      Q                       0               5
0                5
                                                             ]
                                     L = 35 - (2Q + 1/5.1/3Q?)
                                                              0
                                     L = 35 - 10 - 8 1/3
    CARA II : INTEGRAL               L = 16 ? satuan luas
       7
         ¡Ò
    L = (5P - 10)1/2 dP
       2                       7
    L = { 2/3(5P - 10)
                      3/2. ? }]
                               2
    L = 2/15.{ 25 } 3/2
    L = 16 ? satuan luas
P         P = 5 + 1/12Q2
1.Fungsi pendapatan    2. 12
  dari suatu pabrik
  diberikan sebagai
  berikut :                    LUAS I
                          8
  R = 6 + 350Q ¨C 2Q2           LUAS II
Fungsi produksinya :                         P = 12 - 1/9Q2
  Q = 3L                  5
Jika jumlah tenaga                                        Q
  kerja yang ada 25       0              6
  orang,berapakah
  MPRL dan jelaskan
  artinya .
6                                P         P = 5 + 1/12Q2
Luas I = ¡Ò(12 - 1/9Q2)dQ - 8X6   2. 12
        0
                      6
= ( 12Q + 1/9.1/3Q3) ] - 48
                      0                  LUAS I

= (12.6 + 1/27.63 ¨C (12.0 +         8
  1/27.03) - 48                          LUAS II
                                                        P = 12 - 1/9Q2
= (72 + 1/27.216 ¨C 0) - 48          5

= (72 + 8 ¨C 0) - 48                                                 Q
                                    0               6
= 80 ¨C 48
= 32
6                       P         P = 12 - 1/9Q2
Luas II = 6X8 - ¡Ò(5 + 1/12Q2)dQ 2.
               0                   12
                          6
= 48 ¨C ( 5Q + 1/12.1/3Q3) ]
                          0             LUAS I

= 48 ¨C (5.6 + 1/36.63 ¨C (5.0 +     8
  1/36.03)                              LUAS II
                                                       P = 5 + 1/12Q2
= 48 ¨C (30 + 1/36.216 ¨C 0)         5

= 48 - (30 + 6 - 0)                                                Q
                                   0               6
= 48 ¨C 36
= 12
1.Fungsi pendapatan dari suatu pabrik diberikan sebagai berikut :
                      R = 6 + 350Q ¨C 2Q2
Fungsi produksinya : Q = 3L
Jika jumlah tenaga kerja yang ada 25 orang,berapakah MPRL dan
   jelaskan artinya .
Jawab :
R = 6 + 350Q - 2Q?                  Q = 3L
dR = 350 ¨C 4Q                     dQ = 3
dQ                                dL
                      MPRL = dR = dR . dQ
                               dL dQ dL
                                   = (350 ¨C 4Q).3
                 L = 25          Q =3L = 75
                               dR = (350 ¨C 300).3 = 175
                                dL
Artinya: Untuk setiap penambahan Tenaga Kerja sebanyak 25 orang akan
   menyebabkan penambahan pendapatan sebanyak 175 ,dan sebaliknya

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Integral

  • 2. INTEGRAL TAK TENTU CONTOH : 1.¡Ò 3 dx = 3x + c 2.¡Ò 5 dt = 5t + c 3.¡Ò 8 dQ = 8Q + c 4.¡Ò 56 du = 56 u + c
  • 3. 2. ¡Ò ax b dx = a x b+1 + c b+1 CONTOH : 1.¡Ò 4X3 dx = 4 x 4 + c = x4 + c 4 2. ¡Ò 3x8 dx = 3 x 9 + c =1/3X9 + C 9
  • 4. 3. ¡Ò aUb dU = a U b+1 + c b+1 U=f(x) CONTOH : 1. ¡Ò (2X+ 1)dx = ¡­ 2. ¡Ò (4X + 4) dX = ¡­ -1 X2 + X (4X2+8X+6)3 4 (4x2+8x+6)2 Jawab : jawab : Misal : U = X2 + X Misal : U =4X2+8X+6 dU =( 2X + 1)dX dU =(8X+8)dX ¡Ò (2X + 1)dx = ¡Ò dU dU =2(4X+4)dX X2 + X U dU =(4X+4)dX = Ln U + C 2 = Ln ( X2 + X ) + C ¡Ò dU = ¡Ò ? U -3 dU 2U3 = ?.1/-2 .U-2 + C = - ?(4X2+8X+6) -2 + C
  • 5. 4.¡ÒUdV = U.V - ¡ÒVdU RUMUS DI ATAS ADALAH CONTOH : RUMUS INTEGRAL PARSIAL ¡ÒX.eX dx = ¡­. Misal : U = X du = dx dv = eX dx V=¡ÒeX dX = eX + C ¡ÒX.eX dx = U.V - ¡ÒV dU = X.eX - ¡Ò eX dx = X.eX - eX + C
  • 6. 5.¡Ò ex dx = ex + c 6.¡Ò[f(x) + g(x)] dx =¡Ò f(x)dx+¡Òg(x)dx 7.¡Òn.f(x)dx = n¡Òf(x)dx
  • 7. SOAL SELESAIKANLAH ! 1. ¡Ò X3 dX = ¡­ 6. ¡Ò ¡Ì 2 + 5X dX = ¡­ 2. ¡ÒX -4 dX = ¡­ 7.¡Ò (X2 + 3X + 4)3(2X + 3)dx =¡­ 3. ¡Ò9X2 dX = ¡­ 8. ¡Ò X2 + 3X ¨C 2 dX = ¡­ 4. ¡Ò5/X dX = ¡­ X 5. ¡Ò(X2 -¡ÌX + 4) dX = ¡­ 9. ¡ÒX.e x? dX = ¡­
  • 8. INTEGRAL TERTENTU UNTUK a < c < b,berlaku b b b b 1.¡Ò f(x) dx = [F(X)] = F(b)- F(a) 4. ¡Ò k f(x) dx =k ¡Ò f(x) dx a a a a a b b b 2.¡Ò f(x) dx = 0 5. ¡Ò [f(x) + g(x)]dx = ¡Òf(x)dx + ¡Òg(x)dx a a a a b a c b b 3.¡Ò f(x) dx = - ¡Ò f(x) dx 6. ¡Òf(x)dx + ¡Òf(x)dx = ¡Ò f(x)dx a b a c a
  • 9. SOAL 6 0 1.¡Ò X dX = ¡­. 5. ¡Ò (X2 ¨C 2X + 3) dX = ¡­ 4 3 3 3 2. ¡Ò (X2 ¨C 2X + 3 ) dX = ¡­ 6. ¡Ò (2X + 1)(3 ¨C X) dX = ¡­ 0 1 1 4 3. ¡Ò (2X + 5) dX = ¡­ 7. ¡Ò ( ¡Ì X ¨C X )2 dX = ¡­ -1 1 -4 8 4. ¡Ò (3X2 + 2X) dX = ¡­ 8. ¡Ò (X1/3 ¨C X-1/3) dX = ¡­.. -6 1 2 2a 9. ¡Ò (X + 9X3) dX = ¡­ 10. ¡Ò (a + X ) dX = ¡­ 1 a
  • 11. SURPLUS KONSUMEN Fungsi demand Fungsi demand SK SK SK P1 Q Q O Q1 O P P
  • 12. SURPLUS PRODUSEN P P SP P1 Fungsi supply SP P1 Fungsi supply Q Q O Q1 O Q1
  • 13. P P Fungsi demand SK SK Fungsi supply P1 P1 SP SP Q O Q1 O Q 0 Q1
  • 14. PENGETAHUAN DASAR LUAS DAERAH Y CARA I : L= axt 2 5 L= 4x3 LUAS = ¡­? 2 L= 6 satuan luas 2 X CARA II : Integral O 4 4 L= ¡Ò(5-3/4x)dx ¨C 2x4 CARA III: INTEGRAL 0 5 4 L=¡Ò( 2 ) dy ? = (5X ¨C ?.1/2X )] - 8 0 Y= 5-3/4x = (5.4 ¨C 3/8.16) ¨C (5.0-1/4.0) ¨C 8 X= 20/3 ¨C 4y = (20 ¨C 6) ¨C 0 ¨C 8 5 = 14 - 8 L = ¡Ò (20/3 ¨C 4/3Y)dy = 6 satuan luas 2 L= 6 satuan luas
  • 15. LUAS DAERAH P 6 CARA I: INTEGRAL 5 LUAS P= 6 ¨C 3/25 Q ? L=¡Ò ( 6 ¨C 3/25Q?)dQ ¨C 3x5 3 0 5 0 Q 5 L = (6Q ¨C 3/25.1/3Q?)] ¨C 15 0 L = 10 satuan luas CARA II: INTEGRAL 6 L=¡Ò (50 ¨C 25/3P)1/2 dP 3 6 L = { 2/3(50 ¨C 25/3P)3/2.(-3/25)} ] 3 L = { - 2/5 (50 ¨C 25/3P)3/2 L = 10 satuan luas
  • 16. P LUAS= ¡­? 2 P 2 Q 6 3 CARA II : INTEGRAL 6 2 ¡Ò L = 6X6 - (2 + 2/3Q)dQ Q 0 6 0 6 { L = 36 ¨C 2Q + 2/3.1/2Q? }] 0 CARA I : RUMUS L = 36 ¨C 24 = 12 satuan luas L = axt 2 CARA III : integral L= 4x6 6 2 ¡Ò L = ( 3/2 P ¨C 3 ) dP L = 12 satuan luas 2 6 L = ( 3/4P ¨C 3P ) ] = 9 + 3 = 12 satuan luas 2
  • 17. LUAS DAERAH P P = 2 + 1/5Q? 7 CARA I : INTEGRAL LUAS 5 2 L = 7x5 - ¡Ò( 2 + 1/5Q?)dQ Q 0 5 0 5 ] L = 35 - (2Q + 1/5.1/3Q?) 0 L = 35 - 10 - 8 1/3 CARA II : INTEGRAL L = 16 ? satuan luas 7 ¡Ò L = (5P - 10)1/2 dP 2 7 L = { 2/3(5P - 10) 3/2. ? }] 2 L = 2/15.{ 25 } 3/2 L = 16 ? satuan luas
  • 18. P P = 5 + 1/12Q2 1.Fungsi pendapatan 2. 12 dari suatu pabrik diberikan sebagai berikut : LUAS I 8 R = 6 + 350Q ¨C 2Q2 LUAS II Fungsi produksinya : P = 12 - 1/9Q2 Q = 3L 5 Jika jumlah tenaga Q kerja yang ada 25 0 6 orang,berapakah MPRL dan jelaskan artinya .
  • 19. 6 P P = 5 + 1/12Q2 Luas I = ¡Ò(12 - 1/9Q2)dQ - 8X6 2. 12 0 6 = ( 12Q + 1/9.1/3Q3) ] - 48 0 LUAS I = (12.6 + 1/27.63 ¨C (12.0 + 8 1/27.03) - 48 LUAS II P = 12 - 1/9Q2 = (72 + 1/27.216 ¨C 0) - 48 5 = (72 + 8 ¨C 0) - 48 Q 0 6 = 80 ¨C 48 = 32
  • 20. 6 P P = 12 - 1/9Q2 Luas II = 6X8 - ¡Ò(5 + 1/12Q2)dQ 2. 0 12 6 = 48 ¨C ( 5Q + 1/12.1/3Q3) ] 0 LUAS I = 48 ¨C (5.6 + 1/36.63 ¨C (5.0 + 8 1/36.03) LUAS II P = 5 + 1/12Q2 = 48 ¨C (30 + 1/36.216 ¨C 0) 5 = 48 - (30 + 6 - 0) Q 0 6 = 48 ¨C 36 = 12
  • 21. 1.Fungsi pendapatan dari suatu pabrik diberikan sebagai berikut : R = 6 + 350Q ¨C 2Q2 Fungsi produksinya : Q = 3L Jika jumlah tenaga kerja yang ada 25 orang,berapakah MPRL dan jelaskan artinya . Jawab : R = 6 + 350Q - 2Q? Q = 3L dR = 350 ¨C 4Q dQ = 3 dQ dL MPRL = dR = dR . dQ dL dQ dL = (350 ¨C 4Q).3 L = 25 Q =3L = 75 dR = (350 ¨C 300).3 = 175 dL Artinya: Untuk setiap penambahan Tenaga Kerja sebanyak 25 orang akan menyebabkan penambahan pendapatan sebanyak 175 ,dan sebaliknya