$$(2x+5)(x+3) = 0$$
Answer
$$ \begin{matrix}x_1 = -3 & x_2 = -\dfrac{ 5 }{ 2 } \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} (2x+5)(x+3) &= 0&& \text{simplify left side} \\[1 em]2x^2+6x+5x+15 &= 0&& \\[1 em]2x^2+11x+15 &= 0&& \\[1 em] \end{aligned} $$
$ 2x^{2}+11x+15 = 0 $ is a quadratic equation.
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