Question
$$x^2+10x+21 = 5$$
Answer
$$ \begin{matrix}x_1 = -2 & x_2 = -8 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} x^2+10x+21 &= 5&& \text{move all terms to the left hand side } \\[1 em]x^2+10x+21-5 &= 0&& \text{simplify left side} \\[1 em]x^2+10x+16 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}+10x+16 = 0 $ is a quadratic equation.
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