$$(3x+5)(x+1) = 0$$
Answer
$$ \begin{matrix}x_1 = -1 & x_2 = -\dfrac{ 5 }{ 3 } \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} (3x+5)(x+1) &= 0&& \text{simplify left side} \\[1 em]3x^2+3x+5x+5 &= 0&& \\[1 em]3x^2+8x+5 &= 0&& \\[1 em] \end{aligned} $$
$ 3x^{2}+8x+5 = 0 $ is a quadratic equation.
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