Help please thank you.

1 answer:

5 0

$3 \sqrt{5} + 6 \sqrt{9} \sqrt{5}$
$3 \sqrt{5}+6 \sqrt{45}$
$3 \sqrt{5}+6*3 \sqrt{5}$
$3 \sqrt{5} + 18 \sqrt{5} = 21 \sqrt{5}$

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