a cube, will be like the one in the picture below, with all equal sides, and therefore with a volume of x³.
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![\bf \textit{volume of a cube}\\\\ V=x^3~~ \begin{cases} x=side's~length\\[-0.5em] \hrulefill\\ V=343 \end{cases}\implies 343=x^3\implies \sqrt[3]{343}=x\implies 7=x](https://img.qammunity.org/2019/formulas/mathematics/middle-school/u2i2jg48werc5w0f1mrzvw0n7vryaeq7xa.png)