Question
$$(16+2x)\cdot(12+2x) = 396$$
Answer
$$ \begin{matrix}x_1 = 3 & x_2 = -17 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} (16+2x)\cdot(12+2x) &= 396&& \text{simplify left side} \\[1 em]192+32x+24x+4x^2 &= 396&& \\[1 em]4x^2+56x+192 &= 396&& \text{move all terms to the left hand side } \\[1 em]4x^2+56x+192-396 &= 0&& \text{simplify left side} \\[1 em]4x^2+56x-204 &= 0&& \\[1 em] \end{aligned} $$
$ 4x^{2}+56x-204 = 0 $ is a quadratic equation.
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