to txuser: As far as I can tell, for Bahamas one neeeds a tourist visa. For Mexico - as long as the cruise is not more than 3 days, one does not need any visa (anyone in the world does not need a Mexico visa for a cruise upto 3 days). For entering back in US, either you can enter on a stamped visa or on AP. Pls check as well.
Discriminant of a Quadratic. The number D = b2 â 4ac determined from the coefficients of the equation ax2 + bx + c = 0. The discriminant reveals what type of roots the equation has. Note: b2 â 4ac comes from the quadratic formula.
Polynomial Discriminant. A polynomial discriminant is the product of the squares of the differences of the polynomial roots. The discriminant of a polynomial is defined only up to constant factor, and several slightly different normalizations can be used. polynomial discriminant is the product of the squares of the differences of the polynomial roots. The discriminant of a polynomial is defined only up to constant factor, and several slightly different normalizations can be used.