What are all the roots, both real and nonreal, of the equation x4 + x2 = 4x2 + 4? Negative one-half, one-half, negative 2 i, 2 i. Negative one-half, one-half, negative i, i. Negative 1, 1, negative 2 i, 2 i. Negative 2, 2, negative i, i.