# Using discriminant to check real or complex solutions

1. Determine whether the following equations have a solution or not? Justify your answer.

a) 5x2 + 8x + 7 = 0

b) (7)1/2y2 - 6y - 13(7)1/2 = 0

c) 2x2 + x - 1 = 0

d) 4/3x2 - 2x + 3/4 = 0

e) 2x2 + 5x + 5 = 0

f) p2 - 4p + 4 = 0

g) m2 + m + 1 = 0

h) 3z2 + z - 1 = 0

2. If x = 3 and x = -5, then form a quadratic equation.

3. What type of solution do you get for quadratic equations where D < 0? Give reasons for your answer. Also provide an example of such a quadratic equation and find the solution of the equation.

4. Steve traveled 200 miles at a certain speed. Had he gone 10mph faster, the trip would have taken 1 hour less. Find the speed of his vehicle

https://brainmass.com/math/basic-algebra/using-discriminant-to-check-real-or-complex-solutions-185638

#### Solution Summary

This solution shows how to use the discriminant to find out whether quadratic equations have real or complex solutions. It also includes solutions of some word problems on quadratic equations.