$$3x^2+11x = 42$$
Answer
$$ \begin{matrix}x_1 = -6 & x_2 = \dfrac{ 7 }{ 3 } \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} 3x^2+11x &= 42&& \text{move all terms to the left hand side } \\[1 em]3x^2+11x-42 &= 0&& \\[1 em] \end{aligned} $$
$ 3x^{2}+11x-42 = 0 $ is a quadratic equation.
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