A) 1, 1
B) - 1, - 1
C) 1, - 1
D) 1, 2
Correct Answer: C
Solution :
\[{{x}^{4}}-{{x}^{3}}+x-1=0\] Þ \[{{x}^{3}}(x-1)+1(x-1)=0\] \[x-1=0\] or \[{{x}^{3}}+1=0\] Þ\[x=1,\,-1,\,\frac{1+\sqrt{3}i}{2},\,\,\frac{1-\sqrt{3}i}{2}\] so its real roots are 1 and - 1.You need to login to perform this action.
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