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using synthetic division and try error , we have

1 -  2   -   11   - 8   -  60   (  5

     5   +   15  + 20 + 60   (

1 + 3   +    4   + 12 ( -3

    -3    +    0   - 12 (

1  + 0 + 4

thus : x^4 -2x^3 - 11x^2 - 8x - 60 = (x - 5)( x + 3) (x^2 + 4) = 0

therefore  x = 5, x = -3 , and  x = +- 2i

 

by Level 2 User (1.0k points)

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