Download presentation

Presentation is loading. Please wait.

1
Factoring ax2 + bx + c “Bottoms Up”

2
6x2 + 13x + 6 Step 1: multiply the constant (c) term by the coefficient (a), of the leading term Constant is 6 Leading term is 6 Therefore 6 * 6 is 36

3
6x2 + 13x + 6 Step 2: Rewrite the equation by replacing the constant with the number in step 1, and remove the leading coefficient. x2 + 13x + 36

4
**Step 3: Factor the new equation from**

step 2: x2 + 13x +36 (x + 4)(x + 9)

5
(x + 4)(x + 9) Step 4: Divide each constant term in the factored form by the original coefficient of the leading term. Original coefficient of the leading term: 6

6
**Then reduce the fractions:**

7
**Step 5: Now we use the “bottoms up” method- Move the denominator into the numerator to get:**

8
Check it- use FOIL:

9
Remember you may check some equations using graphing calculator- type in the equation in y = and find where it crosses the x-axis. Not all equations cross the x-axis. This particular one crosses at x = -2/3 and x = -3/2. Look at these solutions and the end result of step 4, and then look at step 5. Factoring leads to solutions, the zeros, the roots.

10
10x2 - x - 3 Step 1: multiply the constant (c) term by the coefficient (a), of the leading term Constant is -3 Leading term is 10 Therefore -3 * 10 is -30

11
10x2 - x - 3 Step 2: Rewrite the equation by replacing the constant with the number in step 1, and remove the leading coefficient. x2 - x - 30

12
**(x + 5)(x - 6) x2 - x - 30 Step 3: Factor the new equation from**

step 2: x2 - x - 30 (x + 5)(x - 6)

13
(x + 5)(x - 6) Step 4: Divide each constant term in the factored form by the original coefficient of the leading term. Original coefficient of the leading term: 10 (x + 5)(x - 6)

14
**Then reduce the fractions:**

(x + 1)(x - 3)

15
**Step 5: Now we use the “bottoms up” method- Move the denominator into the numerator to get:**

(2x + 1)(5x – 3) (x + 1)(x - 3)

16
(2x + 1)(5x – 3) Check it- use FOIL: 10x2 -6x + 5x – 3 10x2 - x – 3

17
You Try! 6x2 - 2x – 28 Step 1: multiply the constant (c) term by the coefficient (a), of the leading term Constant is -28 Leading term is 6 Therefore 6 * -28 is -168

18
6x2 - 2x – 28 Step 2: Rewrite the equation by replacing the constant with the number in step 1, and remove the leading coefficient. x2 -2x -168

19
**x2 -2x -168 Step 3: Factor the new equation ( x -14 )(x +12 )**

Factors of -168 Sum of factors -2, -84 no -4, 42 -8, 21 13 -12, 14 2 Switch -14, 12 -2

20
( x -14 )(x +12 ) Step 4: Divide each constant term in the factored form by the original coefficient of the leading term. Original coefficient of the leading term: 6 ( x -14 )(x +12 )

21
( x -14 )(x +12 ) Then reduce the fractions: ( x -7 )(x +2 ) Step 5: Now we use the “bottoms up”

22
**( 3x -7 )(x +2 ) Check your answer with factoring (your choice).**

Conversation with a caution 6x2 - 2x – 28 Purpose of factoring

23
**Quick steps! Step 1: multiply (c) (a),**

Step 2: Rewrite the equation by replacing the constant with the number in step 1, and remove the leading coefficient. Step 3: Factor the new equation Step 4: Divide each constant term in the factored form by the original coefficient of the leading term and then reduce the fractions: Step 5: Now we use the “bottoms up”

Similar presentations

Presentation is loading. Please wait....

OK

.

.

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on microcontroller based digital thermometer Ppt on diodes Ppt on economic order quantity examples Ppt on mauryan government Ppt on c programming functions Ppt on gulliver's travels part 3 Ppt on subsoil investigation Ppt on cross site scripting virus Ppt on solar energy conservation Ppt on normal distribution