1. 3.4 Solve Using quadratic formula

2. What is the quadratic formula?
The formula is:
Be careful of your SIGNS!!!!!
Don’t forget to simplify your radical as much as possible!

3. What is a discriminant?
The discriminant is the radical part of the quadratic formula:
It tells us how many answer and what type we should have:
If the discriminant is positive, there are ______.
If the discriminant is zero, there is __________
If the discriminant is negative, there are _____

4. Let’s try some:
4x2 – 8x + 5 = x + 3
3 = -2x2 + 4x

5. 2x2 – 15x = 0…….. Uh oh, something is missing!

6. HW: p. 127 #5 - 18