Question
$$3x(x+5) = 180$$
Answer
$$ \begin{matrix}x_1 = -\dfrac{ 5 }{ 2 }-\dfrac{\sqrt{ 265 }}{ 2 } & x_2 = -\dfrac{ 5 }{ 2 }+\dfrac{\sqrt{ 265 }}{ 2 } \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} 3x(x+5) &= 180&& \text{simplify left side} \\[1 em]3x^2+15x &= 180&& \text{move all terms to the left hand side } \\[1 em]3x^2+15x-180 &= 0&& \\[1 em] \end{aligned} $$
$ 3x^{2}+15x-180 = 0 $ is a quadratic equation.
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