Evaluate square root of 17^2-15^2

$\sqrt{17^{2} - 15^{2}}$

Raise $17$ to the power of $2$ .

$\sqrt{289 - 15^{2}}$

Raise $15$ to the power of $2$ .

$\sqrt{289 - 1 \cdot 225}$

Multiply $- 1$ by $225$ .

$\sqrt{289 - 225}$

Subtract $225$ from $289$ .

$\sqrt{64}$

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

$\sqrt{8^{2}}$

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

$8$

Evaluate square root of 17^2-15^2

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