$$3x^2+5 = -16x$$
Answer
$$ \begin{matrix}x_1 = -\dfrac{ 1 }{ 3 } & x_2 = -5 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} 3x^2+5 &= -16x&& \text{move all terms to the left hand side } \\[1 em]3x^2+5+16x &= 0&& \text{simplify left side} \\[1 em]3x^2+16x+5 &= 0&& \\[1 em] \end{aligned} $$
$ 3x^{2}+16x+5 = 0 $ is a quadratic equation.
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