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The first condition should be followed for numbers that are lower than or equal to 1.

The second condition should be used for numbers that are higher than 1.

Since f^-1(-3) follows the first condition, do 2-(-3)=5.

Similarly, since f^-1(0) also follows the first condition, do 2-0=2.

Since f^-1(3) follows the second condition, as 3 is bigger than 1, do 2*(3)-3^2 = 6-9 = -3

5 + 2 - 3 = 4

The answer is 4. 

f^-1 (-3)     means that  f ( x)  =  - 3

This happens when x  =  3

So  f^-1 ( -3)   = 3

f^-1 (0)  means that   f(x)  =  0

This happens when x = 2

So  f^-1(0)  =  2

f^-1(3)   means  that  f(x)  = 3

This happens when  x = -1

So   f^-1(3)  = -1

So

f^-1 (-3)   + f^-1(0) +  f^-1(3)  =

     3       +     2       +  (-1)  =

4