Question

Help. I got it wrong and have no clue how to get to the right answer!

Answer 1

$\bf 2x+\sqrt{4x^2}+\sqrt[3]{8x^3}\qquad \begin{cases} 4\to 2^2\\ 8\to 2^3 \end{cases}\qquad thus \\\\\\ 2x+\sqrt{2^2x^2}+\sqrt[3]{2^3x^3}\implies 2x+\sqrt{(2x)^2}+\sqrt[3]{(2x)^3} \\\\\\ 2x+2x+2x=\boxed{6x}$