The Discriminant
The value of the discriminant tells us the number of
solutions ( 0, 1, or 2) that the quadratic equation has.
1
x2 - 2x - 3 = 0
x2 - 6x + 9 = 0
x2 - 3x + 4 = 0
b2 - 4ac = 16
b2 - 4ac = 0
b2 - 4ac = - 7
_____ solutions
_____ solutions
_____ solutions
2
If b2 - 4ac > 0, then there are ______ solutions.
If b2 - 4ac = 0, then there is ______ solution.
If b2 - 4ac < 0, then there are ______ solutions.
3
Find the value of the determinant and use it to determine
how many solutions the quadratic equation has.
b2 - 4ac
# solutions
1. 2x2 - 2x - 4 = 0
2. x2 - 6x = - 9
3. 2x2 + 4x + 15 = 0
4
Ch 7 Test
HW # 77
Tuesday
Discriminant Worksheet
5