Determine the set of values for kkk such that x2+2kx+16>0x^2 + 2kx + 16 > 0x2+2kx+16>0 for all real xxx.
k>4k > 4k>4
−4<k<4-4 < k < 4−4<k<4
k<−4k < -4k<−4 or k>4k > 4k>4
k>16k > 16k>16