Question
$$(3x-6)^2-9^2 = 0$$
Answer
$$ \begin{matrix}x_1 = -1 & x_2 = 5 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} (3x-6)^2-9^2 &= 0&& \text{simplify left side} \\[1 em]9x^2-36x+36-81 &= 0&& \\[1 em]9x^2-36x-45 &= 0&& \\[1 em] \end{aligned} $$
$ 9x^{2}-36x-45 = 0 $ is a quadratic equation.
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