(-2x^2/x^7)^4 (Powers of fractions)
(-2x^2/x^7)^4 = (16/x^20)
(-2x^2/x^7)^4 =
[ -2 ]^4 * [ x^2 / x^7] ^4 =
16 * [ 1 / x^5] ^4 =
16 * [ 1 / x^20] =
16 / x^20 just as rarinstraw found.....!!! [ I just wanted to show how he got the answer ]
