Question
$$2x^2+1+5x^2+7 = 0$$
Answer
$$ \begin{matrix}x_1 = \dfrac{ 2 \sqrt{ 14}}{ 7 } i & x_2 = -2 \dfrac{\sqrt{ 14 }}{ 7 } i \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} 2x^2+1+5x^2+7 &= 0&& \text{simplify left side} \\[1 em]7x^2+8 &= 0&& \\[1 em] \end{aligned} $$
$ 7x^{2}+8 = 0 $ is a quadratic equation.
You can use step-by-step quadratic equation solver to see a detailed explanation on how to solve this equation.
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