Disscuss Question 600 of Square Root and Cube Root - General Questions of Square Root and Cube Root :: Aptitude

1.

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

[A].	√5
[B].	2
[C].	4
[D].	3√5

Answer: Option B

Explanation:

√(7 + 3√5)(7 - 3√5)

=

√(7)² - (3√5)²

= √49 - 45 = √4 = 2.

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