Factoring: Difference of Two Squares a2 – b2 = (a + b)(a – b) Examples: x2 – 49 = x2 – 72 = (x + 7)(x – 7) 4 – n2 = 22 – n2 = (2 – n) (2 + n) 9x2 – 25y2 = (3x)2 – (5y)2
Factoring: Difference of Two Squares a2 – b2 = (a + b)(a – b) Examples: x2 – 49 = x2 – 72 = (x + 7)(x – 7) 4 – n2 = 22 – n2 = (2 – n) (2 + n) 9x2 – 25y2 = (3x)2 – (5y)2