SOLUTION: If x^2+x-1=0 what is the value of x^4+(1/x^4)?

Question 1118176: If x^2+x-1=0 what is the value of x^4+(1/x^4)?
Answer by ikleyn(52786) (Show Source): You can put this solution on YOUR website!
.

   = -2 = Replace here x^2 with (1-x) since it is given =  - 2 = 


=  - 2 =  - 2 =  - 2 =  - 2 =  - 2 


=  - 2 = replace  with 1, since   = (1-x) is given =


=  - 2 = -2 = 9 - 2 = 7.

Solved.

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