Question

Compute:
a. (−10 + 9i) + (7 − 5i)

Answer 1

70−63i

Explanation:

−7⋅(−10+9i)=(−7)(−10)+(−7)(9)

i=70−63i

Answer 2

4i - 3

Explanation:

-10 + 9i + 7 - 5i

Collect like terms: 4i - 3