If
, where a and b are positive integers, then the value of √ab is closest to ?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 ie 5.9
(√7 - √3) + (√5 + √3) = √a + √b
√7 + √5 = √a + √b
√a = √7
√b = √5
√ab = √(7 × 5) = √35 = 5.9