Question

help to Factor: x2 - 100

Answer 1

use a^2 - b^2 = (a-b)(a+b)

Answer 2

i got it thanks :)

Answer 3

(x+a)(x+b) = x^2 +bx + ax + ab
= x^2 + (b+a)x + ab

a and b are products of the last term that add up to the middle term

the middle term is zero in this case