Question: We know that if u = f(x), then du = f'(x) dx. Therefore, if u = x3 + 30, then du = dx.

We know that if u = f(x), then du = f'(x) dx.

We know that if u = f(x), then du = f'(x) dx. Therefore, if u = x3 + 30, then du = dx.

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