a)(x+2)^2 - 3^2 = (x+2-3)(x+2+3) = (x-1)(x+5)
b)(x-2)^2 - 5^2 = (x-2-5)(x-2+5) = (x-7)(x+3)
c)x^2 + 3x + x + 3 = x(x+3) + (x+3) = (x+3)(x+1)
d)x^2 - 3x + x - 3 = x(x+1) - 3(x+1) = (x+1)(x-3)
e)9x^2 + 6x + 1 - 36 = (3x+1)^2 - 6^2 = (3x+1-6)(3x+1+6) = (3x-5)(3x+7)
f)25x^2 + 20x + 4 - 25 = (5x+2)^2 - 5^2 = (5x+2-5)(5x+2+5) = (5x-3)(5x+7)
