Question
The square root of `( 7 + 3sqrt(5)) (7 - 3sqrt(5))` is
Answer: Option B
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`sqrt((7 + 3sqrt(5)) (7 - 3sqrt(5)))` = `sqrt((7)^2 - (3sqrt(5))^2)` = ` sqrt(49 - 45)` = `sqrt(4)` = 2.
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