Question

1 square minus b square formula

Answer 1

1^2-b^2 = (1+b)(1-b)
it comes from
(a^2-b^2) = (a+b)(a-b)

Answer 2

(1)^2-(b)^2
Using a^2-b^2=(a+b)(a-b)
=>(1+b)(1-b)