Question 911373
{{{(3x)^(-4) = (3x/1)^(-4)}}} Rewrite 3x as {{{3x/1}}}


{{{(3x)^(-4) = (1/(3x))^(4)}}} Flip the fraction {{{3x/1}}} ---> {{{1/(3x)}}} to make the exponent positive


{{{(3x)^(-4) = (1^4)/((3x)^4)}}}


{{{(3x)^(-4) = (1)/(81x^4)}}} where {{{x<>0}}}