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Square Root and Cube Root
The square root of (7 + 3√5) (7 - 3√5) is
√5
2
4
3√5
Correct Answer:
2
Explanation:
(7 + 3√5)(7 - 3√5)
=
(7)
2
- (3√5)
2
= √49 - 45 = √4 = 2.
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