How do you find all the zeros of  x^4-x^3-20x^2?

May 7, 2016

You must set the expression to 0 and factor.

Explanation:

${x}^{2} \left({x}^{2} - x - 20\right) = 0$

${x}^{2} \left(x - 5\right) \left(x + 4\right) = 0$

$x = 0 , 5 , - 4$

Hopefully this helps!