$$(x+7)(x-7) = 0$$
Answer
$$ \begin{matrix}x_1 = 7 & x_2 = -7 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} (x+7)(x-7) &= 0&& \text{simplify left side} \\[1 em]x^2-7x+7x-49 &= 0&& \\[1 em]x^2-7x+7x-49 &= 0&& \\[1 em]x^2-49 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}-49 = 0 $ is a quadratic equation.
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