1. USING THE FORMULA (SOLVING QUADRATICS) Slideshow 18, Mathematics Mr Richard Sasaki, Room 307

2. Objectives

3. The Quadratic Formula

4. Proof – You don’t need to learn this!

6. The Formula So, the formula is…

7. Examples Here, a = 3, b = 4 and c = 1. Let’s substitute these into the formula.

8. Examples Here, a = 1, b = 2 and c = -3. Let’s substitute these into the formula. Try the worksheets!

9. Answers - Easy -2, 1 -1, 2 / 5 Because we would have to square root a negative number. (Can’t do that).

10. Answers - Medium Because we would need to divide by 0. (You cannot divide by 0.)

11. Answers - Hard