Simplify

(16x^8)^-3/4

1) 16^-3/4*(x^8)^-3/4
2) -12*x^-6
3) -12*1/x^6
4) -12/x^6

Which step is incorrect? Please help!!

1 answer

16^-3/4 = 1/16^3/4 = 1/2^3 = 1/8
1/x^(24/4) = 1/x^6 = x^-6
so I get
(1/8)x^-6