Evaluate square root of 15-2*3

$\sqrt{15 - 2 \cdot 3}$

Multiply $- 2$ by $3$ .

$\sqrt{15 - 6}$

Subtract $6$ from $15$ .

$\sqrt{9}$

Rewrite $9$ as $3^{2}$ .

$\sqrt{3^{2}}$

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

$3$

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