$$4x+8x^2-7 = 0$$
Answer
$$ \begin{matrix}x_1 = -\dfrac{ 1 }{ 4 }-\dfrac{\sqrt{ 15 }}{ 4 } & x_2 = -\dfrac{ 1 }{ 4 }+\dfrac{\sqrt{ 15 }}{ 4 } \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} 4x+8x^2-7 &= 0&& \text{simplify left side} \\[1 em]8x^2+4x-7 &= 0&& \\[1 em] \end{aligned} $$
$ 8x^{2}+4x-7 = 0 $ is a quadratic equation.
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