$$x(x+2) = 143$$
Answer
$$ \begin{matrix}x_1 = 11 & x_2 = -13 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} x(x+2) &= 143&& \text{simplify left side} \\[1 em]x^2+2x &= 143&& \text{move all terms to the left hand side } \\[1 em]x^2+2x-143 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}+2x-143 = 0 $ is a quadratic equation.
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