Firstly, you want to multiply (f^4)^2. [tex] \frac{2*f^8*f^2}{8f^{12}} [/tex]
Next, multiply everything on the numerator. [tex] \frac{2f^{10}}{8f^{12}} [/tex]
Next, divide. [tex] \frac{2f^{10}}{8f^{12}}=\frac{1}{4} f^{-2} [/tex]
Now remember that f^-2 = (1/f^2), so just convert the negative powered exponent to that, and your answer will be [tex] \frac{1}{4f^2} [/tex]
