If x2 + x − 1 = 0 what is the value of \({x^4} + \frac{1}{{{x^4}}}

1.	If x2 + x − 1 = 0 what is the value of \({x^4} + \frac{1}{{{x^4}}}?\)
A.	1
B.	5
C.	7
D.	9
Answer» D. 9

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If x2 + x − 1 = 0 what is the value of \({x^4} + \frac{1}{{{x^4}}}?\)
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If x2 + x − 1 = 0 what is the value of \({x^4} + \frac{1}{{{x^4}}}?\)

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