Evaluate x^2 - 3x + 6 for x=3+i

Question

(3+i)^2 - 3(3+i)+6
3+2i-9-3i+6

I got 0 - 1i
is this correct or do i use 0

Answer 1

from
(3+i)^2 - 3(3+i)+6
= 9 + 6i + i^2 - 9 - 3i + 6
= 3i + 5, remember i^2 = -1