Question

find the product.
$(x - 4)(x + 4)$
$(x - 4)(x + 4)=\square$ (simplify your answer.)

Explanation:

Step1: Apply difference of squares rule

Recall that $(a-b)(a+b)=a^2-b^2$, here $a=x$, $b=4$.

Step2: Substitute values into formula

$x^2 - 4^2$

Step3: Calculate the constant term

$x^2 - 16$

Answer:

$x^2 - 16$