Question

Q13. Simplify 9√5 - 4√5 + √125 :​

Answer 1

Answer:

Step-by-step explanation:

√

125

=

4

√

25

×

5

=

4

×

5

√

5

=

20

√

5

Answer 2

Answer:

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

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