TeX source:

\begin{array}{ll} 1=a b^{2} & \\ 1=6 b^{2} b^{2}=6 b^{4} & \text { Substitute } a . \\ b=\left(\frac{1}{6}\right)^{\frac{1}{4}} & \text { Use properties of exponents to isolate } b . \\ b \approx 0.6389 & \text { Round } 4 \text { decimal places. } \end{array}