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.
The discriminant of a polynomial equation is a value computed from the coefficients which helps us determine the type of roots it has - specifically whether they are real or non-real and distinct or repeated. Quadratic equations. The discriminant #Delta# of a quadratic equation with real coefficients in standard form: #ax^2+bx+c = 0# is given by the formula: #Delta = b^2-4ac# From the discriminant we can discriminate whether the equation has two real roots, one repeated real root or two non-real roots. If #Delta > 0# then the quadratic equation has two distinct real roots.