MathAnalysisCalculusIntegrals

U-substitution

Choosing u

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Consider the following integral:

$\int \frac{9x^2}{\sqrt{3x^3-7}} \ dx$ Which of these would make for the best $u$ -substitution?

Select one option from the list

u = 3x^3

u = 9x^2

u = \sqrt{3x^3-7}

u = 3x^3 - 7

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