+0  
 
0
251
1
avatar+4688 

Help please.

 Dec 7, 2017
 #1
avatar+94295 
+1

 

 

-3   [  1   -2    0  - 4        4 ]

              -3   15  -45   147

         ________________

         1   -5   15  -49    151

 

 

 

x^4  - 41x^2   = -400

 

x^4 - 41x^2 + 400 = 0       factor as

 

(x^2 - 25) (x^2 - 16)  = 0

 

(x + 5) (x  - 5)(x + 4) (x - 4)  = 0 

 

Setting each factor and solving for x produces the real roots  -5, 5, -4, 4

 

 

 

cool cool cool

 Dec 7, 2017
edited by CPhill  Dec 7, 2017

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