$$(2-x)\cdot(2-x) = 0$$
Answer
$$ x = 2 $$
Explanation
$$ \begin{aligned} (2-x)\cdot(2-x) &= 0&& \text{simplify left side} \\[1 em]4-2x-2x+x^2 &= 0&& \\[1 em]x^2-4x+4 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}-4x+4 = 0 $ is a quadratic equation.
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