SOLUTION: Factor f(x)= x^3 -2x^2 -19x+20 completely given 5 is a zero.
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Question 1155805: Factor f(x)= x^3 -2x^2 -19x+20 completely given 5 is a zero.
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
x^3-2x^2-19x+20
(x-5) works
synthetic division
5/1--- -2--- -19--- 20
1---- 3---- -4--- 0
so the other factor is (x^2+3x-4), and that factors into (x+4)(x-1)
(x-5)(x-1)(x+4)
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