$$2x+x^2 = 99$$
Answer
$$ \begin{matrix}x_1 = 9 & x_2 = -11 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} 2x+x^2 &= 99&& \text{simplify left side} \\[1 em]x^2+2x &= 99&& \text{move all terms to the left hand side } \\[1 em]x^2+2x-99 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}+2x-99 = 0 $ is a quadratic equation.
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