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1. Write as a Binomial: (9-w)(9+w) 2. Write each square as a trinomial: (6c-1) ² 3. Simplify: (y+4)(y+10)
a ²-b²     (a+b)(a-b) (First #)² - (Second #) ²  =  (sum of 2 squares) x (their difference)
Ex: 9a ² -4b ² =( 3a + 2b )(3a-2b) 3a is the square root of 9a ²   and 2b is the square root of 4b ²
Ex: 36-25
81-16 *** After you factor the number the first time, if there still is an a ²-b² in the subtraction binomial, you have to factor again until there are no squares left. ***
a ²+(-)2ab+b²     (a+(-)b)² If the middle number in the equation equals twice the square root of a times the square root of b, then you can factor it.
Ex:   a ² +2a+1 = ( a+1 ) ² a and 1 are the square roots of the first and last numbers
Ex: u ² -6u+9
Ex: b ² +12b+4 This trinomial can’t be factored this way because the middle number does not equal twice the product of the first and last number.
Ex: 121c^4-264c ² +144 ^4 means to the fourth power****
x²+(-)bx+c     (x + factor of b that adds to c) (x +(-) factor of b that adds to c)
Ex:   x ² +8x+15 = (x+ 3 ) (x+ 5 ) 5 and 3 add up to 8, and are a factor pair of 15.
Ex: x ² -10x+24
Ex: y ² +20yz+91z ²
Ex: x^4-15x ² y ² -16y^4
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Special factor patterns

  • 2. 1. Write as a Binomial: (9-w)(9+w) 2. Write each square as a trinomial: (6c-1) ² 3. Simplify: (y+4)(y+10)
  • 3. a ²-b²  (a+b)(a-b) (First #)² - (Second #) ² = (sum of 2 squares) x (their difference)
  • 4. Ex: 9a ² -4b ² =( 3a + 2b )(3a-2b) 3a is the square root of 9a ² and 2b is the square root of 4b ²
  • 6. 81-16 *** After you factor the number the first time, if there still is an a ²-b² in the subtraction binomial, you have to factor again until there are no squares left. ***
  • 7. a ²+(-)2ab+b²  (a+(-)b)² If the middle number in the equation equals twice the square root of a times the square root of b, then you can factor it.
  • 8. Ex: a ² +2a+1 = ( a+1 ) ² a and 1 are the square roots of the first and last numbers
  • 9. Ex: u ² -6u+9
  • 10. Ex: b ² +12b+4 This trinomial can’t be factored this way because the middle number does not equal twice the product of the first and last number.
  • 11. Ex: 121c^4-264c ² +144 ^4 means to the fourth power****
  • 12. x²+(-)bx+c  (x + factor of b that adds to c) (x +(-) factor of b that adds to c)
  • 13. Ex: x ² +8x+15 = (x+ 3 ) (x+ 5 ) 5 and 3 add up to 8, and are a factor pair of 15.
  • 14. Ex: x ² -10x+24
  • 15. Ex: y ² +20yz+91z ²
  • 16. Ex: x^4-15x ² y ² -16y^4
  • 17. Ìý