Question

simplify : 9√5 - 2√20 + √125 in formula ​

Answer 1

Answer:

$10 \sqrt{5}$

Step-by-step explanation:

$9 \sqrt{5} - 2 \sqrt{4 \times 5} + \sqrt{25 \times 5} \\ 9 \sqrt{5} - 2 \times 2 \sqrt{5} + 5 \sqrt{5} \\ 9 \sqrt{5} - 4 \sqrt{5} + 5 \sqrt{5} \\ 10 \sqrt{5}$

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