Find roots of polynomial $$ p(x) = 2x^2+5x+9 $$
Answer
The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= -\frac{ 5 }{ 4 }+\frac{\sqrt{ 47 }}{ 4 }i\\[1 em]x_2 &= -\frac{ 5 }{ 4 }- \frac{\sqrt{ 47 }}{ 4 }i \end{aligned} $$Explanation
The solutions of $ 2x^2+5x+9 = 0 $ are: $ x = -\dfrac{ 5 }{ 4 }+\dfrac{\sqrt{ 47 }}{ 4 }i ~ \text{and} ~ x = -\dfrac{ 5 }{ 4 }-\dfrac{\sqrt{ 47 }}{ 4 }i$.
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