Question

Solve the equation by extracting square roots.
3x^2 = 81

Answer 1

3x^2 = 81
x^2 = 27
x = root 27, - root 27
x = 3 root 3, - 3 root 3

Answer 2

\[3x^2=81\]
\[x^2=27\]
\[x=\pm\sqrt{27}=\pm3\sqrt{3}\]