$$3x^2+10x = -8$$
Answer
$$ \begin{matrix}x_1 = -2 & x_2 = -\dfrac{ 4 }{ 3 } \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} 3x^2+10x &= -8&& \text{move all terms to the left hand side } \\[1 em]3x^2+10x+8 &= 0&& \\[1 em] \end{aligned} $$
$ 3x^{2}+10x+8 = 0 $ is a quadratic equation.
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