+0  
 
0
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avatar+66 

Just can't wrap my head around this.

 

What is the result of dividing x^3-7 by x+2?

 

Options

 

Thank You!

PhoenixForever  Oct 31, 2018
 #1
avatar+90968 
+2

The thing that might be giving you trouble is that we have to account for the missing powers  in 

 

x^3  -  7

 

To rectify this....write this as   x^3  + 0x^2 + 0x - 7

 

So we have

 

 

               x^2  -  2x  +  4

x + 2  [   x^3   +   0x^2  +  0x    - 7  ]

              x^3   +   2x^2

            _______________________

                       -2x^2  +  0x

                      -2x^2   -  4x

                    ____________________

                                  4x     -    7

                                  4x     +   8

                                ___________

                                           - 15

 

So...the result   is    x^2  - 2x  + 4  -   15 / ( x + 2)    [ Third answer ]

 

 

 

cool cool cool

CPhill  Oct 31, 2018
 #2
avatar+66 
+1

Thank you very much for explaining!

PhoenixForever  Oct 31, 2018

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