Problem Solving 1

Answer: A

\begin{equation*}
\begin{split}
16y^2 - 9z^2& = (4y)^2 - (3z)^2\:\:\:\:\:\color{blue}a^2 - b^2 = (a + b)(a - b)\\\\
16y^2 - 9z^2& = (4y + 3z)(4y - 3z)
\end{split}
\end{equation*}