$$(x+5)(x+5)+3x = 0$$
Answer
$$ \begin{matrix}x_1 = -\dfrac{ 13 }{ 2 }-\dfrac{\sqrt{ 69 }}{ 2 } & x_2 = -\dfrac{ 13 }{ 2 }+\dfrac{\sqrt{ 69 }}{ 2 } \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} (x+5)(x+5)+3x &= 0&& \text{simplify left side} \\[1 em]x^2+5x+5x+25+3x &= 0&& \\[1 em]x^2+13x+25 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}+13x+25 = 0 $ is a quadratic equation.
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