1. April 2, 2009
If half of a number is equal to 4 more than twice
the number, what is the number?
(A) ­ 3
(B) ­ 8/3
(C) 0
(D) 7/2
(E) 4

2. Approximating Square Root Values
1
2
3
4
5
6 What about negatives?
7
­1
8
9
10

3. Vertex (max. or min.) c ­ value
­ b
x = 2a (axis of symmetry)
Plug in x­value to find y
x ­ intercepts
a ­ value
Set y = 0
Solve for x

4. Graphing Overview
Look at a­value is it a or a
­ b
Find vertex x = 2a
Plug in x to find y
Either: Find 2 points to the right of vertex
Or: Find zeros

5. You Hate Factoring?
Well, One More Way to Solve Quadratics!
­ b ± √b2 ­ 4ac
Quadratic Formula: x =
2a
­ Can be used for ANY quadratic equation
­ Quadratic must be in the form:
0 = ax2 + bx + c
y2 = 39y ­ 17
Example:

6. HW: Practice 10­6 Wksht #2­26 (1/3), 53, 55
­ Just find a, b, and c; set up word problems
Practice 10­3 Wksht #36­51 (1/3)