How do you find all the zeros of #f(x)=x^4 - x^3 - 20x^2#?
1 Answer
Feb 27, 2016
Factor
#x=0# (twice),#x=5# and#x=-4#
Explanation:
Separate out the common factor
#f(x) = x^4-x^3-20x^2#
#=x^2(x^2-x-20)#
#=x^2(x-5)(x+4)#
Hence zeros: