The answer to this inequality would be -9
This should be the correct answer. i hope this helps you out.
have a nice and wonderful day :)
Firstly, you want to multiply (f^4)^2. 
Next, multiply everything on the numerator. 
Next, divide. 
Now remember that f^-2 = (1/f^2), so just convert the negative powered exponent to that, and your answer will be 
6/56 = 3/28........................