Q's from GMATprep

[janavi]

Had trouble with these Questions, please help.

[ryanthagreat]

The answer is E.

To do this algebraically, you can plug in A+B for X and then compare it to what happens when you plug in A and B into each equation and then add them. But its much easier to just plug in numbers. Let's say A is 1, B is 2, and A+B is 3.

Here is what you get, the first number is f(A+B), the second will be F(A) +F(B)

A. 9 3
B. 4 5
C. [3^(1/2)] [1+2^(1/2)]
D. 2/3 3
E. -9 -9 => Equal