For which kkk does x2+kx+1=0x^2 + kx + 1 = 0x2+kx+1=0 have no real solutions?
k=2k = 2k=2 or k=−2k = -2k=−2
k<−2k < -2k<−2
k>2k > 2k>2
−2<k<2-2 < k < 2−2<k<2