Question

Factorize it.

y^2 - 4.

Answer 1

Hey,

(y+2)(y-2) .

Hope this helps you buddy!!
Take care always ##

Answer 2

y^2-4
= y^2-2^2
= a^2-b^2 = (a+b)(a-b)
= y^2 - 2^2 = (y+2)(y-2)