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  • 03-05-2017
  • Mathematics
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Аноним Аноним
  • 03-05-2017
this is an equation of degrees 6 so it will have a total of 6 roots.If you draw the 
 graph  on calculator  it touches the x axis at x = -2 and x = 2

If we plug in x =2 and x = -2  they fit the equation .

Also as the graph just touches the x axis this shows that  x = 2 and x = -2 are duplicated 
That gives us the 4 roots and also the  +/- 2i    giving a total of 6 roots.

The second option is correct

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