What is the simplified form of the following expression? 7(^3 square root 2x) - 3 (^3 square root 16x) -3 (^3 square root 8x)

The third option listed:

Step-by-step explanation:

We start by writing all the numerical factors inside the qubic roots in factor form (and if possible with exponent 3 so as to easily identify what can be extracted from the root):

And now we combine all like terms (notice that the only two terms we can combine are the first two, which contain the exact same radical form:

Therefore this is the simplified radical expression:

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