a) Find all zeros of the polynomial Q(z) = z4 + 1.

The polynomial function f ( x ) = x 3 − 13 x 2 + 46 x − 48 has three real zeros. One of the three real zeros is 2. Type either of the other two real zeros in the answer box. Do not type both of the other real zeros. Type only one of them (either one) in the answer box.