$$(x+13)(x-13) = 731$$
Answer
$$ \begin{matrix}x_1 = 30 & x_2 = -30 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} (x+13)(x-13) &= 731&& \text{simplify left side} \\[1 em]x^2-13x+13x-169 &= 731&& \\[1 em]x^2-13x+13x-169 &= 731&& \\[1 em]x^2-169 &= 731&& \text{move all terms to the left hand side } \\[1 em]x^2-169-731 &= 0&& \text{simplify left side} \\[1 em]x^2-900 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}-900 = 0 $ is a quadratic equation.
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