Question
$$\frac{3x^2+5}{x^2+16} = 0$$
Answer
$$ \begin{matrix}x_1 = \dfrac{\sqrt{ 15 }}{ 3 } i & x_2 = - \dfrac{\sqrt{ 15 }}{ 3 } i \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} \frac{3x^2+5}{x^2+16} &= 0&& \text{multiply ALL terms by } \color{blue}{ x^2+16 }. \\[1 em](x^2+16)\frac{3x^2+5}{x^2+16} &= (x^2+16)\cdot0&& \text{cancel out the denominators} \\[1 em]3x^2+5 &= 0&& \\[1 em] \end{aligned} $$
$ 3x^{2}+5 = 0 $ is a quadratic equation.
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