Question

If f (z) = z2 - z + 1, then f (1 - i) equals: a) i
b) -i + 1
c) i - 1
d) i + 1
e) -i ?

Answer 1

(1-i)^2 - (1-i) + 1
Evaluate, it equals -i

e) -i

Answer 2

I found -2i-1+i+1=-i I want know how can this be "i -1" (is the correct answeer)

Answer 3

Is it right say that -i is the same of i-1?Because it seems so '-'