Finding possible and actual rational roots

[duki]

Homework Statement

a) 2x^4 - 15x^3 + 23x^2 + 15x - 25 = 0
b) 12x^3 - 20x^2 + 23x - 10 = 0

Homework Equations

The Attempt at a Solution

I was wondering if you guys could check my answers.

For A:

Possibles: +/- {1, 5, 25} / {1, 2}
Actual: 5, 5/2

 

[duki]

And for B:

Possibles: +/- {1, 5, 10} / {1, 2, 3, 4, 6}
Actual: None

 

[Mark44]

And for B:

Possibles: +/- {1, 5, 10} / {1, 2, 3, 4, 6}
Actual: None

Possibles: +/- {1, 2, 5, 10} / {1, 2, 3, 4, 6, 12}