SOLUTION: I need to find the rational and real zeros of 2x^4-x^3-23x^2+10x+30. I have already found -1, and 3/2 to be rational zeros, but I end up with 2x^2-20, and I don't know what to do w

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: I need to find the rational and real zeros of 2x^4-x^3-23x^2+10x+30. I have already found -1, and 3/2 to be rational zeros, but I end up with 2x^2-20, and I don't know what to do w      Log On


   

Question 237136: I need to find the rational and real zeros of 2x^4-x^3-23x^2+10x+30. I have already found -1, and 3/2 to be rational zeros, but I end up with 2x^2-20, and I don't know what to do with it, can you help?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
2x^2 - 20 yields two real (but not rational) zeros

2x^2 - 20 = 0

x^2 - 10 = 0

x^2 = 10

x = ± sqrt(10)