$$28x^2 = -7$$
Answer
$$ \begin{matrix}x_1 = \dfrac{ 1 }{ 2 } i & x_2 = -\dfrac{ 1 }{ 2 } i \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} 28x^2 &= -7&& \text{move all terms to the left hand side } \\[1 em]28x^2+7 &= 0&& \\[1 em] \end{aligned} $$
$ 28x^{2}+7 = 0 $ is a quadratic equation.
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