College Algebra (10th Edition)

$x=0$ or $x=81$
We solve by factoring: $x^{3/4}-9x^{1/4}=0$ $x^{1/4}(x^{1/2}-9)=0$ $x^{1/4}=0$ or $x^{1/2}=9$ $x=0^4$ or $x=9^2$ $x=0$ or $x=81$