x^2-25 (x-5)(x+5) (x-5)(x+5) (x-5)(x+5) x+5x^2-3x-10 = x^2+2x-5x-10 = x(x+2)-5(x+2) = (x-5)(x+2) = x+2
x^2-25 (x-5)(x+5) (x-5)(x+5) (x-5)(x+5) x+5
x^2-3x-10 = x^2+2x-5x-10 = x(x+2)-5(x+2) = (x-5)(x+2) = x+2