Let z 11 8i and w 18 9i Compute the following and express

Let

z = 11 + 8i

and

w = 18 9i.

Compute the following and express your answer in

a + bi

form.

z w

Solution

given

z = 11 + 8i

and

w = 18 9i.

z w

=( 11 + 8i)-(18-9i)

=(11-18)+(8-(-9))i

=-7 +17i