Question

You might need:Factor completely.640 – 10x2=Show Calculator

Answer 1

$\begin{gathered} 640-10x^2,\text{ since 640/10=64, we have} \\ 640-10x^2=10(64-x^2),\text{ since 64=8\textasciicircum{}2, we have} \\ =10(8^2-x^2) \\ =10(8-x)(8+x) \end{gathered}$