Question
$$(x\cdot10)^2 = 100$$
Answer
$$ \begin{matrix}x_1 = 1 & x_2 = -1 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} (x\cdot10)^2 &= 100&& \text{simplify left side} \\[1 em]100x^2 &= 100&& \text{move all terms to the left hand side } \\[1 em]100x^2-100 &= 0&& \\[1 em] \end{aligned} $$
$ 100x^{2}-100 = 0 $ is a quadratic equation.
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