The document appears to be notes from a math class that include: 1) A warm up section with 6 math problems; 2) A review of factoring by grouping with 4 examples; 3) An announcement about an upcoming class work handout and factoring trinomials tomorrow.

1. Today
27
Warm-Up
Review:
Changing the sign when
Grouping
Class Work

2. Warm Up
1. Write the equation of a line passing through the
points (2, -2) & (3,2)
2. Two hamburgers and three cokes cost $10.50. Four
hamburgers and four cokes cost $18.00. Find the cost of
a hamburger and a coke. 4. A ring costs $1590 after a 6%
sales tax. What was the pre-tax
3.
cost of the ring?
5. 120% of what number is 42?
6. Factor: (x2 + 16)

3. Khan Academy
Factoring Difference of Squares 2
1. 64x2− 25
2. 49x2−16
3. 400x2−9

4. Review: Factor by Grouping
Example 1: x3 – 3x2 –16x + 48
Step 1: Arrange the terms so that the first two terms have a
common factor and the last two terms have a common factor.
x2 (x-3) –16 ( x – 3) (x2 – 16)(x – 3)
When the first term of the second group is negative, change
both signs before factoring. (Explanation to follow)
– (16x – 48)

5. Review: Factor by Grouping
Example 2: 2ac + 4ax - 5c – 10x
= (2ac + 4ax) - (5c + 10x) = 2a(c + 2x) - 5(c + 2x)
= (c + 2x) (2a - 5) Foil the two binomials to check.
Example 3: = (x + 9)(2 – y)
Last Example:
Example 4: ac +bc + a + b

6. Class Work
Handout: All
Hint: 1 Problem is not factorable
Include Scratch Paper
Tomorrow:
Factoring Trinomials

7. 4. Write an expression for the
area of the rectangle.
A. x2 - 20 C. x2 – 20x - 1
B. x2 – 9x – 20 D. x2 – x – 20