Answers

2014-08-15T02:04:32+05:30
As f(x) is linear then assume, f(x) = ax + b.

then gof = a^{2} x^{2} + a (1 + 2b)x + ( b^{2} + b - 2)

Now compare and solve for a and b.
a^{2} = 2
b^{2} + b - 2 = 2

After getting a and b, just verify whether a(1 + 2b) = -5 or not.

As it's not verified so there are two possibilities.
(1) You have typed wrong function
(2) Answer is "No Such f(x) exists".
2 4 2
tough but good answer
not tough, because we have to start by this way only, I guess.....