$$(x+8)(x-8) = 260$$
Answer
$$ \begin{matrix}x_1 = 18 & x_2 = -18 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} (x+8)(x-8) &= 260&& \text{simplify left side} \\[1 em]x^2-8x+8x-64 &= 260&& \\[1 em]x^2-8x+8x-64 &= 260&& \\[1 em]x^2-64 &= 260&& \text{move all terms to the left hand side } \\[1 em]x^2-64-260 &= 0&& \text{simplify left side} \\[1 em]x^2-324 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}-324 = 0 $ is a quadratic equation.
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