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

$y=\pm\sqrt{6}$
Since $x^2=a$ implies $x=\pm\sqrt{a}$ (the Square Root Principle), the solutions to the given equation, $5y^2=30 ,$ are \begin{array}{l}\require{cancel} y^2=\dfrac{30}{5} \\\\ y^2=6 \\\\ y=\pm\sqrt{6} .\end{array}