$$ \begin{aligned} (x-5)(x-5) &= 0&& \text{simplify left side} \\[1 em]x^2-5x-5x+25 &= 0&& \\[1 em]x^2-10x+25 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}-10x+25 = 0 $ is a quadratic equation.
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