Question

What is the factored form of the expression?

4x2 – 81y2
A. (2x + 9)(2x – 9)

B. (2x + 9y)(2x – 9y)

C. (2x + 9y)2

D. (2x – 9y)2

Answer 1

@monays have you already attempted this one?

Answer 2

Use the algebraic properties like:


LEARN THESE PROPERTIES!
\[(a+b)^2 = a^2 + 2ab + b^2\]
\[(a-b)^2 = a^2 - 2ab + b^2\]
\[(x+a)(x+b) = x^2 + (a+b)x + ab\]
\[a^2-b^2 = (a+b)(a-b)\]

Okay? :)