Question
Find roots of polynomial $$ p(x) = 4x^3-44x^2+120x $$
Answer
The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 0\\[1 em]x_2 &= 6\\[1 em]x_3 &= 5 \end{aligned} $$Explanation
Step 1:
Factor out $ \color{blue}{ 4x }$ from $ 4x^3-44x^2+120x $ and solve two separate equations:
$$ \begin{aligned} 4x^3-44x^2+120x & = 0\\[1 em] \color{blue}{ 4x }\cdot ( x^2-11x+30 ) & = 0 \\[1 em] \color{blue}{ 4x = 0} ~~ \text{or} ~~ x^2-11x+30 & = 0 \end{aligned} $$One solution is $ \color{blue}{ x = 0 } $. Use second equation to find the remaining roots.
Step 2:
The solutions of $ x^2-11x+30 = 0 $ are: $ x = 5 ~ \text{and} ~ x = 6$.
You can use step-by-step quadratic equation solver to see a detailed explanation on how to solve this quadratic equation.
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