Find the solution of the equation x + 2(sqrt{x – 8}) = 0

A.
(4, 16) 
B.
(2, 4) 
C.
(4, 1) 
D.
(1, 16) 
E.
(16, 16)
Correct Answer: Option A
Explanation
x + 2(sqrt{x – 8}) = 0, Let x = y
x = y^{2}
y^{2} + 2y – 8 = 0
(y + 4)(x – 2) = 0
y = 4 or 2
x = 16 or 4