Let z 15 4i and w 11 9i Compute the following and express

Let

z = 15 + 4i

and

w = 11 9i.

Compute the following and express your answer in

a + bi

form.

z w

z = 15 + 4i , w = 11 - 9i

z - w = (15 + 4i) - (11 - 9i)

==> z - w = 15 + 4i - 11 + 9i

==> z - w = (15 - 11) + (4 + 9)i

==> z - w = 4 + 13i

Hence z - w = 4 + 13i