Evaluate 5 square root of 64

$5 \sqrt{64}$

Step 1

Rewrite $64$ as $8^{2}$ .

$5 \sqrt{8^{2}}$

Step 2

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

$5 \cdot 8$

Step 3

Multiply $5$ by $8$ .

$40$

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