Question

11+root 18
$11 + \sqrt{18}$
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Answer 1

$11 + \sqrt{18} \\ = 11 + \sqrt{9 \times 2} \\ = 11 + \sqrt{3 {}^{2} \times 2} \\ = 11 + \sqrt{3 {}^{2} } \times \sqrt{2} \\ = 11 + 3 \sqrt{2 } \: \: \: \: or \\ \: \: \: 15.24$