1. Aim: How do we use quadratic formula to solve equation?
Do Now: 1. Solve for x:
2. Solve for x:
3. Solve for x:

2. The standard form of a quadratic equation is
# 3 is little hard to factor, therefore, we can use a different method to solve it.
The standard form of a quadratic equation is
where a, b,c are real numbers and
Let’s solve by completing square

4. This is called quadratic formula, and we can use it to solve any quadratic equation

5. Let’s try to use the quadratic formula to solve
First of all, we need to identify the values of a, b and c
a = 4, b = – 5 and c = – 6

6. Solve for x:

7. Solve for x:

8. Solve for x: 1. 2. 3.