Question
Quantitative Aptitude Question on Functions
Let f(x) = x2 and g(x) = 2X , for all real x. Then the value of f( f(g(x)) + g(f(x)) ) at x = 1 is
A
16
B
18
C
36
D
40
Answer
36
Explanation
Solution
The correct answer is (C):
f [f(2x) + g(x2)]
as x = 1,
f [f(2) + g(1)]
= f [22 + 21]
= f [6] = 62
= 36