## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Fill the blank with $x^{\frac{1}{4}}$.
With substitution $u=x^{\frac{1}{4}}$, and $x^{\frac{1}{2}}=u^{2}$. The equation becomes $u-u^{2}-2=0$. Multiply both sides by $-1$ to get $u^{2}-u-2=0$.