$$3(x^2-1) = 0$$
Answer
$$ \begin{matrix}x_1 = 1 & x_2 = -1 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} 3(x^2-1) &= 0&& \text{simplify left side} \\[1 em]3x^2-3 &= 0&& \\[1 em] \end{aligned} $$
$ 3x^{2}-3 = 0 $ is a quadratic equation.
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