Find roots of polynomial $$ p(x) = x^3+ \cancel{x} -\cancel{x}+4 $$
Answer
The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= -1.5874\\[1 em]x_2 &= 0.7937+1.3747i\\[1 em]x_3 &= 0.7937-1.3747i \end{aligned} $$Explanation
Step 1:
Combine like terms:
$$ x^3+ \, \color{blue}{ \cancel{x}} \, \, \color{blue}{ -\cancel{x}} \,+4 = x^3+4 $$Step 2:
Polynomial $ x^3+4 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.
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