Question

simplify
^3√-343x^3 = my answer is -7x is this correct

Answer 1

I don't understand the question. Click the "equation" button and type your equation that way. :) It looks like it's asking...

\[\sqrt[3]{-343x^3}\]

but I want to make sure.

Answer 2

yes it must be since 343 is a perfect cube.

\[7^3=343\] so you have
\[\sqrt[3]{-343x^3}=-7x\]