GATE | GATE-CS-2014-(Set-2) | Question 65

GATECS2014Q5

(A) 3.464
(B) 3.932
(C) 4.000
(D) 4.444


Answer: (C)

Explanation:

let x = the given expression.
Now squaring both sides.

(x)^2 = 12 + x
(x)^2 - x - 12 = 0

Now solve this quadratic equation for finding the 
roots(value of x, or this expression).
(x-4)(x+3) = 0

hence x = 4.


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