+0  
 
0
53
4
avatar+1857 

Another one of these 

RainbowPanda  Sep 19, 2018
 #1
avatar+90023 
+2

Again...set   2r + 1  = 0   ⇒   r =  -1/2  ....this is what we need to divide by

 

 [ note.....we need the  "placeholder" 0   to denote that there is no r^2 term...!!!]

 

-1/2  [  2      1       0       20      12    ]    

                   -1      0        0       -10

        ________________________

          2      0       0        20       2

 

The remainder,2,  is correct....

 

The apparent remaining polynomial is  2r^3  + 20

 

If we performed polynomial division....the first term would be r^3...as follows

 

               r^3

2r + 1  [ 2r^4

             -(2r^4)

            _________

 

So...this indicates that we need to divide each term of the apparent  residual polynomal by 2, the get the correct answer of

 

r^3  + 10  R  [ 2 / (2r + 1) ]

 

 

cool cool cool

CPhill  Sep 19, 2018
edited by CPhill  Sep 19, 2018
 #2
avatar+1857 
+1

Thank you I actually got this one haha

RainbowPanda  Sep 19, 2018
 #3
avatar+90023 
+2

Excellent....!!!!

 

Are you beginning to see this  ???

 

 

cool cool cool

CPhill  Sep 19, 2018
 #4
avatar+1857 
+1

A little bit. Some problems are easier than others though..

RainbowPanda  Sep 19, 2018

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