$$x^2 = 25$$
Answer
$$ \begin{matrix}x_1 = 5 & x_2 = -5 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} x^2 &= 25&& \text{move all terms to the left hand side } \\[1 em]x^2-25 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}-25 = 0 $ is a quadratic equation.
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