$$(x-50)(x+50) = 0$$
Answer
$$ \begin{matrix}x_1 = 50 & x_2 = -50 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} (x-50)(x+50) &= 0&& \text{simplify left side} \\[1 em]x^2+50x-50x-2500 &= 0&& \\[1 em]x^2+50x-50x-2500 &= 0&& \\[1 em]x^2-2500 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}-2500 = 0 $ is a quadratic equation.
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