Question

ok if you can help solve these last ones im good to go and i thank everyone for all their help

Answer 1

\[\sqrt[3]{40x^3}=\sqrt[3]{2^3*5*x^3}=2x \sqrt[3]{5}\]is your answer
there are several way to write answer by factor,I don't know which way, you want write,I try do this some
\[2x(\sqrt[3]{5})\]or\[\sqrt[3]{5}(2x)\]

Answer 2

\[\sqrt{16x^2}=|4x|=4|x|\]

\[(\sqrt{10}+5\sqrt{2})(\sqrt{10}+5\sqrt{2})=10-50=-40\]