81y4 - 16
i know its A2 – b2 = (a-b)(a+b) but i cant figure it out
2 answers
helpppppppp
When writing online, x^2 = x squared.
(9y^2 - 4)(9y^2 + 4) = (3y - 2)(3y + 2)(9y^2 + 4)
(9y^2 - 4)(9y^2 + 4) = (3y - 2)(3y + 2)(9y^2 + 4)