$$3(b^2-4b+4) = 0$$
Answer
$$ b = 2 $$
Explanation
$$ \begin{aligned} 3(b^2-4b+4) &= 0&& \text{simplify left side} \\[1 em]3b^2-12b+12 &= 0&& \\[1 em] \end{aligned} $$
$ 3x^{2}-12x+12 = 0 $ is a quadratic equation.
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