Answer
Choice B
Work Step by Step
Using $(a+b)(a-b)=a^2-b^2$ or the product of the sum and difference of like terms, the given expression, $
(x+7)(x-7)
,$ is equivalent to
\begin{array}{l}
x^2-7^2
\\\\=
x^2-49
\end{array}
Hence, the answer is $\text{
Choice B
.}$
