+0  
 
0
51
1
avatar+53 
 Dec 22, 2018
 #1
avatar+94275 
+2

1. If x + 2 is a factor, then x = -2 is a root

Using synthetic division

 

-2  [ 5   8   -7   - 6  ]

          -10   4     6

       ____________

       5    -2  -3    0

 

Since we get 0 as a remainder, then -2 is a root and (x + 2) is a factor

 

 

2.  Likewise....if (x + 1) is a  factor and - 1 is a root.....so...

 

 

-1  [   5    8    -7     - 6 ]

              -5   -3      10

        ______________

         5   3    -10     4

 

Since the remainder is not = 0, then  -1 is not a root  .....so  x + 1  is not a factor

 

 

 

cool cool cool

 Dec 22, 2018

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