For what value(s) of kkk does the equation 2x2+kx+8=02x^2 + kx + 8 = 02x2+kx+8=0 have exactly one real solution?
k=±4k = \pm 4k=±4
k=±8k = \pm 8k=±8
k=±82k = \pm 8\sqrt{2}k=±82
k=±42k = \pm 4\sqrt{2}k=±42