$$s^2+24s+276 = 1$$
Answer
$$ \begin{matrix}s_1 = -12+\sqrt{ 131 }i & s_2 = -12-\sqrt{ 131 }i \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} s^2+24s+276 &= 1&& \text{move all terms to the left hand side } \\[1 em]s^2+24s+276-1 &= 0&& \text{simplify left side} \\[1 em]s^2+24s+275 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}+24x+275 = 0 $ is a quadratic equation.
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