Simplify square root of 1+16+64

$\sqrt{1 + 16 + 64}$

Add $1$ and $16$ .

$\sqrt{17 + 64}$

Add $17$ and $64$ .

$\sqrt{81}$

Rewrite $81$ as $9^{2}$ .

$\sqrt{9^{2}}$

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

$9$

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