Question

$simplify \: 13 \sqrt{2 \: } + \: \sqrt{2 \: } - 5 \sqrt{2}$
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Answer 1

$13 \sqrt{2 \: } + \: \sqrt{2 \: } - 5 \sqrt{2}</p><p>\\ \\ = (13 + 1 - 5 )\sqrt{2} \\ \\ = (14 - 5) \sqrt{2} \\ \\ = \green {\boxed{9 \sqrt{2}}}$