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

Answer:

B is correct

Step-by-step explanation:

$4x^{2} -16 = (2x)^{2} - 4^{2}$ = (2x+4)(2x-4) = 2(x+2)2(x-2) = 4(x+2)(x-2)