Question

Let Z be equal to (2-5i)

The question is

z^2 +iz -(5+i)
The answer I got for this was
-22 + 18i but it isn't correct on my homework page please help/

Answer 1

z^2 +iz -(5+i)

= (2-5i)^2 + i(2-5i) - (5+i)
= 4 - 20i + 25i^2 + 2i - 5i^2 - 5 - i
= 4 - 20i - 25 + 2i + 5 - 5 - i
= -21 - 19i