There are two postive integers c for which the equation 5x^2 + 12x + c = 0 has rational solutions. What is the product of those two values of c?
Look at the discriminant of the Quadratic fromula for this quadratic
sqrt ( 144 - 4(5)c) )
sqrt(144-20c) is rational when c = 4 or 7
it becomes sqrt(64) or sqrt 4