neeti2711 wrote:What is the value of [√(9-√65) - √(9+√65)]^2?
(A) 10
(B) √65
(C) 18-5√13
(D) 18
(E) 18+5√13
BALLPARK.
[√(9-√65) - √(9+√65)]²
≈ [√(9-8) - √(9+8)]²
= (√1 - √17)²
≈ (1 - more than 4)²
= (less than -3)²
= more than 9.
The correct answer is
A.
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