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Factoring Quadratic Trinomials 5/6/01PowerPoint Presentation

Factoring Quadratic Trinomials 5/6/01

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Factoring Quadratic Trinomials 5/6/01

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Factoring Quadratic Trinomials5/6/01

Objective: you will factor quadratic polynomials into a pair of binomials

- Put in descending order of exponents like ax²+bx+c and multiply a*c
- Find two numbers whose product is (a*c), BUT whose sum is ‘b’
- Rewrite ax²+ [larger factor]x + [smaller factor]x +c ( larger factor takes the same sign as ‘b’)
- Factor the first pair of terms and factor the second pair of terms(by dividing out the common factor for each pair and if the 3rd term is negative, then factor it out also)
- Factor out the common binomial factor
- Write as a pair of binomials

Order and multiply a*c

Find factors of (a*c), but their sum is ‘b’

Write the new polynomial

Double Factor

Factor the binomial

Write a pair of binomials

Factors of 8Sum of 6?

1,89

2,46

-1,-8-9

-2,-4-6

x²+4x+2x+8

x(x+4) +2(x+4)

x(x+4) +2(x+4)

(x+4)(x+2)

Factors of –21,Sum of –4?

1,-21-20

3,-7-4

-1,2120

-3,74

x² -7x+3x – 21

x(x-7) +3(x-7)

x(x-7) +3(x-7)

(x-7) (x+3)

- Order and multiply a*c
- Find factors of (a*c), but their sum is ‘b’
- Rewrite the new polynomial
- Double Factor
- Factor the binomial
- Write a pair of binomials

Order and multiply a*c

Find factors of (a*c), but their sum is ‘b’

Rewrite the new polynomial

Double Factor

Factor the binomial

Write a pair of binomials

Factor –30Sum of 7?

1,-30-29

2,-15-13

3,-10-7

5,-6-1

-1,3029

-2,1513

-3, 107

-5,61

y²+ 10y–3y –30

y(y+10) –3(y+10)

y(y+10) –3(y+10)

(y+10) (y-3)

Order and multiply a*c

Find factors of (a*c), but their sum is ‘b’

Rewrite the new polynomial

Double Factor

Factor the binomial

Write a pair of binomials

Factors of 30Sum of –13?

1,3031

2,1517

3,1013

5,611

-1-,30-31

-2,-15-17

-3,- 10-13

-5,-6-11

2x²-10x-3x +15

2x(x -5) -3(x -5)

2x(x -5) -3(x -5)

(x -5)(2x –3)

Order and multiply a*c

Find factors of (a*c), but their sum is ‘b’

Rewrite the new polynomial

Double Factor

Factor the binomial

Write a pair of binomials

Factors of 315Sum of 44?

1, 315316

3, 105108

5, 6368

7, 4552

9, 3544

15r² +35r +9r +21

5r(3r +7) +3(3r +7)

5r(3r +7) +3(3r +7)

(3r +7)(5r +3)

x² +2x –80 (no peeking)

Factors of –80Sum of 2?

-1, 8079

-2, 4038

-4, 2016

-8, 102

x²+10x –8x –80

x(x +10) –8(x +10)

x(x +10) –8(x +10)

(x +10)(x –8)

3y² -22y –16

Factors of-48Sum of –22

1, -48-47

2, -24-22

3y² -24y +2y –16

3y(y –8) +2(y –8)

3y(y –8) +2(y –8)

(y -8)(3y +2)

Now practice !!!