Determine the following sums or differences. (a) (7 + 2i) + (4 + 9i) (b) (8 + 9i) - (- 2 – 5i) (a) (7 + 2i) + (4 + 9i) = (Simplify your answer. Type your answer in the form a + bi.) (b) (8 + 9i) – (-...

Determine the following sums or differences.

Extracted text: Determine the following sums or differences. (a) (7 + 2i) + (4 + 9i) (b) (8 + 9i) - (- 2 – 5i) (a) (7 + 2i) + (4 + 9i) = (Simplify your answer. Type your answer in the form a + bi.) (b) (8 + 9i) – (- 2– 5i) = (Simplify your answer. Type your answer in the form a + bi.)