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The square root of (7 +3√ 5) (7 - 3√5) is

A.

 5

B.

2

C.

4

D.

3√5

See Answer & Explanation Lets Discuss
Correct answer is : B
Explanation (7 + 35)(7 - 35)=√(7)2 - (35)2  = √49 - 45  = √ = 2.
 

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