Which is the value of the discriminant for the quadratic equation 0=x+2+x^2

Acable car begins its trip by moving up a hill. as it moves up, it gains elevation at a constant rate of 50 feet/minute until it reaches the peak at 2,000 feet. then, as the car moves down to the hill’s base, its elevation drops at the same rate.

Name the most appropriate metric unit for each measurement like the mass of cow

Is this a polynomial function? i need to know asap