Question

answer me fast please


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Answer 1

Answer:

$9 \sqrt{5} - 4 \sqrt{5} + \sqrt{125} \\ = 9 \sqrt{5} - 4 \sqrt{5} + \sqrt{25 \times 5} \\ = 9 \sqrt{5} - 4 \sqrt{5} + 5 \sqrt{5} \\ = (9 - 4 + 5) \sqrt{5} \\ = 10 \sqrt{5}$

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Step-by-step explanation:

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Answer 2

Answer:

$9 \sqrt{5} - 4 \sqrt{5} + \sqrt{125} \\ = 9 \sqrt{5} - 4 \sqrt{5} + \sqrt{5 \times 5 \times 5} \\ 9 \sqrt{5} - 4 \sqrt{5} + 5 \sqrt{5} \\ 9 - 4 + 5 \sqrt{5} \\ = 10 \sqrt{5}$