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Multiplying Binomials and Special Products

Part 1: Multiplying Binomials

 

Multiplying binomials is a huge concept in the unit of factoring. If you do not know what a binomial is, its a polynomial that has two terms. 

 

For example:  a + 4 or 2 - f

 

 

Now lets try examples:

 

1) x(x+3)                                    2) 3(x+5)                                    Challenge: (x+4)(x+5)

 

= x2 + 3x                                   = 3x + 15                                      = x2+5x+4x+20

                                                                                                      = x2+ 9x+20 

 

 

Part 2: Expanding Special Products

 

This may seem hard, but if you follow along with the video and the examples it will become much simple. 

 

Example 1:  (5x-2)(x+4)                        Example 2: (2x+5)2

                  = 5x2+ 20x-2x-8                   = (2x+5)(2x+5)

                  =5x2+18x-8                          = 4x2+10x+10x+25

                                                                = 4x2+20x+25

 

Now try these on your own!

 

1) (4x+5)2                                            2) (6x+7)2                             

 

 

 

 

3) (7x+10)2                                          4) (3x+8)2

 

 

 

 

*Challenge Question*

 

5) 6(3x-2)(2x-3)-2(4x-3)(2x-5)

 

 

 

 

Answers:

 

 

 

 

 

 

 

 

 

 

 

 

Video: Multiplying Binomials and Special Products

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