Answer
$$40^\circ,-320^\circ$$
Work Step by Step
Angles coterminal to angle $\theta$ are given by $\theta \pm n\times360^\circ$ where n is an integer.
Therefore, an angle coterminal with $400^\circ$ that is positive is
$$400^\circ - (1)360^\circ = 40^\circ$$
and an angle coterminal with $400^\circ$ that is negative is
$$400^\circ - (2)360^\circ = 400^\circ -720^\circ =-320^\circ$$