1. 3-4 MORE Factoring!

2. Factoring by using the Greatest Common Factor
2x2 + 8x - 6 =
3x2 - 9x – 24 =
8x2 – 40 =
4x2 – 10x + 2 =
6x2 - 6 =
2x2 +8x – 24 =

3. Always check for a GCF first!!!!!!
If you cannot factor out a GCF, then try this next method.
This method you are about to see is not mathematically sound --- it is a TRICK that works.

4. Slide and Divide x²+11x+3( ) Slide the leading coefficient
x²+11x+18 Multiply
(x+9 )(x+2 ) Factor, then DIVIDE by leading coefficient
( x+3/ )( x+1/ ) Simplify fractions, then slide denominators in front of x’s 6 2 3 /6 /6

5. Factor by using slide and divide.
6x2 – x – 2
Click here for answer

6. If a GCF can be taken out first, you MUST take out the GCF before you “slide and divide.”
8x2  12x  4
Click here for answer

7. Factor the expression. If the expression cannot be factored, say so.
3x2  10x  8 (only 2 will not factor)
2x2  5x  3
4x2  4x  1
2x2  5x  1 Copy the problem into your notebook and
4x2  5x  factor it.
2x2  11x  15
9x2  12x  4 *These are the problems from WB 4.4 (p. 62)
12x2  24x 9 if you still have your workbook page
18x2  2 from yesterday. If not, copy these
12x2  17x  6 down.
15x2  8x 16
4x2  5
12x2 39x  9
18x2  9x  14
20x2  54x  36
42x2  35x  7
12x2 x  11
80x2  68x  12

9. Bellwork:
Factor: 4x2 - 25
Factor: 9x2 – 64
Solve x2 – 25x +100 = 0

10. Solve the equation.
4x2  5x  6 = 0

11. Solve the equation.
9x2  12x  3 = 0

12. The area of the rectangle is 78cm. Find the length of each side.
x+2
3x + 1