SOLUTION: Solve each equation. Round your answers to the nearest tenth when necessary. x^3 - 4x^2 - 5x = 0

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: Solve each equation. Round your answers to the nearest tenth when necessary. x^3 - 4x^2 - 5x = 0      Log On


   

Question 83698: Solve each equation. Round your answers to the nearest tenth when necessary.
x^3 - 4x^2 - 5x = 0
Answer by funmath(2933) About Me  (Show Source):
You can put this solution on YOUR website!
Solve each equation. Round your answers to the nearest tenth when necessary.
x^3 - 4x^2 - 5x = 0
x(x^2-4x-5)=0
x(x-5)(x+1)=0
x=0 or x=5=0 or x+1=0
x=0 or x-5+5=0+5 or x+1-1=0-1
x=0 or x=5 or x=-1
:
Proof:
If x=0
0^3-4(0)^2-5(0)=0
0-0-0=0
0=0
If x=5
(5)^3-4(5)^2-5(5)=0
125-4(25)-25=0
125-100-25=0
0=0
If x=-1
(-1)^3-4(-1)^2-5(-1)=0
-1-4(1)+5=0
-1-4+5=0
0=0
We're right!!!!
Happy Calculating!!!!