$$h^2+5 = -2$$
Answer
$$ \begin{matrix}h_1 = \sqrt{ 7 } i & h_2 = -\sqrt{ 7 } i \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} h^2+5 &= -2&& \text{move all terms to the left hand side } \\[1 em]h^2+5+2 &= 0&& \text{simplify left side} \\[1 em]h^2+7 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}+7 = 0 $ is a quadratic equation.
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