Find roots of polynomial $$ p(x) = 20x^3-21x^2-10x+5 $$
Answer
The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 0.3376\\[1 em]x_2 &= -0.5751\\[1 em]x_3 &= 1.2875 \end{aligned} $$Explanation
Polynomial $ 20x^3-21x^2-10x+5 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.
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