Find roots of polynomial $$ p(x) = d^2+2d+2 $$
Answer
The roots of polynomial $ p(d) $ are:
$$ \begin{aligned}d_1 &= -1+i\\[1 em]d_2 &= -1-i \end{aligned} $$Explanation
The solutions of $ d^2+2d+2 = 0 $ are: $ d = -1+i ~ \text{and} ~ d = -1-i$.
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