Question

hello there
what is the condition of using this formula?
a^2-b^2=(a+b)(a-b)

Answer 1

When you want to factor, both a and b have to be perfect squares

Answer 2

if a=b can i use it?

Answer 3

yea u can use it in that case

Answer 4

cause the overall result will always be zero

Answer 5

this is an identity and identities are are applicable for evry value of x