Question

Multiply (4 – 7i)(2 + 9i).

Answer 1

Explanation:

Starting with distribute property we would get:

4x2 + 4x9i - 14i - 63i^2

8 + 36i - 14i - 63i^2

We know that i^2 = -1 so -63(-1) would give us 63

8 + 63 = 71 + 22i

Answer 71 + 22i