Question

Use the difference of two squares formula to factor. Be sure to factor out any common factors.

y^2 - 49

Answer 1

(y-7)(y+7)

Answer 2

is it this:
y^2-49
(y)^2 - (7)^2
and as we know that a^2 - b^2 = (a+b)(a-b)
hence the solution will be:
(y+7)(y-7)