For what range of kkk does the inequality x2−kx+1>0x^2 - kx + 1 > 0x2−kx+1>0 hold for all real xxx?
k>2k > 2k>2
k<−2k < -2k<−2
k∈(−2,2)k \in (-2, 2)k∈(−2,2)
k∈(−1,1)k \in (-1, 1)k∈(−1,1)