a problem im having problems with...

consider the quadratic equation (-2p+1)x^2 + (p-2)x + 6p = 0

A) find the discriminant (7p-2)^2?

B) for p not equal to 1/2 show that there are always two rational solutions and find these solutions.

Could someone check if A is right and I dont know how to work out B?

thanks *