Question

Mario was given the problem, 4x^2-16, to factor completely.

He wrote (2x + 4)(2x-4). Is he correct?

A. No, Mario should have factored out GCF as well. The correct answer is 2(x + 2)(x - 2)

B. No, Mario should have factored out GCF as well. The correct answer is 4(x + 2)(x - 2)

Answer 1

B is correct

Explanation:

`4x^(2) -16 = (2x)^(2) - 4^(2)` = (2x+4)(2x-4) = 2(x+2)2(x-2) = 4(x+2)(x-2)