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. In the quadratic formula, the expression under the square root sign, b 2 â 4 ac, is called the discriminant. The sign of the discriminant can be used to find the number of solutions of the corresponding quadratic equation, ax 2 + bx + c = 0.If the discriminant b 2 â 4 ac is negative, then there are no real solutions of the equation.f the discriminant is positive, then the Â± symbol means you get two answers. The solutions of this equation correspond to the x-intercepts of the parabola. y = ax 2 + bx + c. So, you can also use the discriminant to find the number of x-intercepts of a parabola.