Which of the following polynomials does not have real roots?
Ax2 - 17x - 7
B-x4 + 4x2 + 6
Cx4 + 2x2 + 2
D2x2 - 13 ...?
Ax2 - 17x - 7
B-x4 + 4x2 + 6
Cx4 + 2x2 + 2
D2x2 - 13 ...?