$$x^2+2x = 5$$
Answer
$$ \begin{matrix}x_1 = -1-\sqrt{ 6 } & x_2 = -1+\sqrt{ 6 } \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} x^2+2x &= 5&& \text{move all terms to the left hand side } \\[1 em]x^2+2x-5 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}+2x-5 = 0 $ is a quadratic equation.
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