Question

-√72 answer and explain

Answer 1

\[72=2^3\times 3^2\] so
\[\sqrt{72}=2\times 3\times \sqrt{2}\]
therefore
\[-\sqrt{72}=-6\sqrt{2}\]

Answer 2

might be easier just to say
\[-\sqrt{72}=-\sqrt{36\times 2}=-6\sqrt{2}\]