A number added with its additive inverse equals zero. Create a function that returns an array of additive inverses.
additiveInverse([5, -7, 8, 3]) ➞ [-5, 7, -8, -3]
additiveInverse([1, 1, 1, 1, 1]) ➞ [-1, -1, -1, -1, -1]
additiveInverse([-5, -25, 35]) ➞ [5, 25, -35]