1. Quadratic Formula
By Mahra & Misaki

2. When to use quadratic formula?
It can be used to solve any quadratic equation.
When it is inconvenient or impossible to solve equation by factoring or completing the square, quadratic formula is useful.
ax² + bx + c = 0
*For real constants a, b, and c, with a ≠ 0*

3. How to get the quadratic formula?

4. That is how to derive the quadratic formula from the general form ;)

5. So this is the quadratic formula:

6. Solutions of the quadratic equation

7. For example:

8. A quadratic equation can have two, one, or zero real solutions.
When there are two solution, the line crosses the x-axis twice.

9. When there is one solution, the line crosses the x-axis once.

10. When there is no real solution, the line does NOT cross the x-axis.

11. Bibliography http://www.mathwarehouse.com/quadr atic/images/
ratic-formula-proof/

12. Thank you for listening.D