Question
$$-8x = x^2-9$$
Answer
$$ \begin{matrix}x_1 = 1 & x_2 = -9 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} -8x &= x^2-9&& \text{move all terms to the left hand side } \\[1 em]-8x-x^2+9 &= 0&& \text{simplify left side} \\[1 em]-x^2-8x+9 &= 0&& \\[1 em] \end{aligned} $$
$ -x^{2}-8x+9 = 0 $ is a quadratic equation.
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