Evaluate - cube root of -729

$- \sqrt[3]{- 729}$

Step 1

Rewrite $- 729$ as ${(- 9)}^{3}$ .

$- \sqrt[3]{{(- 9)}^{3}}$

Step 2

Multiply.

Pull terms out from under the radical, assuming real numbers.

$- - 9$

Multiply $- 1$ by $- 9$ .

$9$

$9$

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