Question

For i^2 =-1, (3-i)^2 = ?

A. 8
B. 10
C. 8-6i
D. 8 + 6i
E. 10-6i

Answer 1

C. 8- 6i
(3- i) to the power of 2 (expand the expression)

9- 6 i + i to the power of 2
calculate

9 - 6i - 1
calculate

8- 6i.