Question

please explain it in detail

Answer 1

Hello Dear!!

Here's your answer

√45 = 3√5
√605 = 11√5
√245 = 7√5

3√5 + 11√5 - 7√5 = 7√5

7 x 2.236 = 15.652

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Hope it helped you!!
Sindhu

Answer 2

Hello Mate!

$\sqrt{5} = 2.236 \\ \sqrt{45} = \sqrt{9 \times 5} = 3 \sqrt{5} \\ \sqrt{605} = \sqrt{121 \times 5} = 11 \sqrt{5} \\ \sqrt{245} = \sqrt{49 \times 5} = 7 \sqrt{5} \\ 3 \sqrt{5} + 11 \sqrt{5} - 7 \sqrt{5} \\ 7 \sqrt{5} = 7 \times 2.236 \\ = 15.652$
Hence option ( A )

Hope it helps☺!✌