Question

$9 \sqrt{5} - 4 \sqrt{5} + \sqrt{125}$
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Answer 1

Answer:

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Step-by-step explanation:

$9 \sqrt{5} - 4 \sqrt{5} + \sqrt{125} \\ 5 \sqrt{5} + \sqrt{125} \\ 5 \sqrt{5} + \sqrt{5 \times 5 \times 5} \\ 5 \sqrt{5} + 5 \sqrt{5} (pair \: of \: five \: and \: five \: get \: common ) \\ 10 \sqrt{5} \: \: \: \: ans.$