For which values of kkk does the quadratic equation x2+kx+4=0x^2 + kx + 4 = 0x2+kx+4=0 have no real solutions?
k>4k > 4k>4
k<−4k < -4k<−4
−4<k<4-4 < k < 4−4<k<4
k>4k > 4k>4 or k<−4k < -4k<−4