waecmaths question:
Evaluate $2\sqrt{28}-3\sqrt{50}+\sqrt{72}$
Option A:
$4\sqrt{7}-21\sqrt{2}$
Option B:
$4\sqrt{7}-11\sqrt{2}$
Option C:
$4\sqrt{7}-9\sqrt{2}$
Option D:
$4\sqrt{7}+\sqrt{2}$
waecmaths solution:
$\begin{align} & 2\sqrt{28}-3\sqrt{50}+\sqrt{72}=2\sqrt{4\times 7}-3\sqrt{25\times 2}+\sqrt{36\times 2} \\ & 2\sqrt{28}-3\sqrt{50}+\sqrt{72}=4\sqrt{7}-15\sqrt{2}+6\sqrt{2} \\ & 2\sqrt{28}-3\sqrt{50}+\sqrt{72}=4\sqrt{7}-9\sqrt{2} \\\end{align}$
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