Question

Express each of the following in a + ib form.

1. (2 – 4i) + (5 + 3i)

2. (1 – i) – (-1 + 6i)

3. 3(7 + 7i) + i(7 + 7i)

4. (\(\frac{1}{2} + i \frac{2}{5}\))−(4+\(\frac{5}{2}\)i)

Answer 1

1. (2 – 4i) + (5 + 3i) = (2 + 5) + (-4 + 3)i = 7 – i

2. (1 – i) – (-1 + 6i) = 1 – i + 1 – 6i = 2 – 7i

3. 3(7 + 7i) + i(7 + 7i) = 21 + 21i + 7i – 7 = 14 + 28i

4.