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Simplify 5+73+7

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Simplify 5+73+7

A.

17-√7

B.

4-√7

C.

15+√7

D.

7-√7

Correct answer is B

5+73+7=5+73+7×3737=(5+7)(37)3272=1557+37797=8272
Factorize then divide by 2
=2(472=47