SOLUTION: Investigate to see if (2x+5) is a factor of 2x^3-3x^2-12x+20=0 Solve the equation.

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equation Customizable Word Problems -> SOLUTION: Investigate to see if (2x+5) is a factor of 2x^3-3x^2-12x+20=0 Solve the equation.      Log On


   

Question 367075: Investigate to see if (2x+5) is a factor of 2x^3-3x^2-12x+20=0
Solve the equation.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
If 2x%2B5 is a factor, then
2x=-5
x=-5%2F2 is a zero.
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graph%28300%2C300%2C-4%2C2%2C-3%2C3%2C0%2C2x%5E3-3x%5E2-12x%2B20%29
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It looks promising.
For complete verification, plug x=-5%2F2 into the equation and verify that the output is equal to zero.