Question
$$-4 = x(2+1)^2$$
Answer
$$ x = -\dfrac{4}{9} $$
Explanation
$$ \begin{aligned} -4 &= x(2+1)^2&& \text{simplify right side} \\[1 em]-4 &= x\cdot3^2&& \\[1 em]-4 &= x\cdot9&& \text{ swap the left and right side of the equation } \\[1 em]x\cdot9 &= -4&& \text{ divide both sides by $ 9 $ } \\[1 em]x &= -\frac{4}{9}&& \\[1 em] \end{aligned} $$
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