Question
$$5(9x^2-4) = 0$$
Answer
$$ \begin{matrix}x_1 = \dfrac{ 2 }{ 3 } & x_2 = -\dfrac{ 2 }{ 3 } \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} 5(9x^2-4) &= 0&& \text{simplify left side} \\[1 em]45x^2-20 &= 0&& \\[1 em] \end{aligned} $$
$ 45x^{2}-20 = 0 $ is a quadratic equation.
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