$$3x^2-11x = 42$$
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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