For what values of kkk does x2+kx+k+8>0x^2 + kx + k + 8 > 0x2+kx+k+8>0 for all real xxx?
−8<k<4-8 < k < 4−8<k<4
−4<k<8-4 < k < 8−4<k<8
−2<k<4-2 < k < 4−2<k<4
0<k<80 < k < 80<k<8