How do you use the factor theorem to determine whether x=5 is a root of #x^4-3x^3-9x^2-5x=0#?
1 Answer
Mar 28, 2018
Explanation:
#"if x = 5 is a root then if "f(5)=0" x = 5 is a root"#
#rArr(5)^4-3(5)^3-9(5)^2-5(5)#
#=625-375-225-25=0#
#rArrx=5" is a root"#
