Question
$$(9x+12)^2+2025 = 0$$
Answer
$$ \begin{matrix}x_1 = -\dfrac{ 4 }{ 3 }+5i & x_2 = -\dfrac{ 4 }{ 3 }-5i \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} (9x+12)^2+2025 &= 0&& \text{simplify left side} \\[1 em]81x^2+216x+144+2025 &= 0&& \\[1 em]81x^2+216x+2169 &= 0&& \\[1 em] \end{aligned} $$
$ 81x^{2}+216x+2169 = 0 $ is a quadratic equation.
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