Find roots of polynomial $$ p(x) = -13-20x-19x^2-3x^3 $$
Answer
The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= -5.2142\\[1 em]x_2 &= -0.5596+0.7197i\\[1 em]x_3 &= -0.5596-0.7197i \end{aligned} $$Explanation
Step 1:
Write polynomial in descending order
$$ \begin{aligned} -13-20x-19x^2-3x^3 & = 0\\[1 em] -3x^3-19x^2-20x-13 & = 0 \end{aligned} $$Step 2:
Polynomial $ -3x^3-19x^2-20x-13 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.
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