Please help!!Which of the following expressions are equivalent to (2+i)^2 where i is the imaginary number:
I. (-2-i)^2
II. 3+4i
III. 3

a. I only
b. II only
c. III only
d. I and II only
e. I and III only

Question

Please help!!Which of the following expressions are equivalent to (2+i)^2 where i is the imaginary number:
I.  (-2-i)^2
II. 3+4i
III. 3


a. I only
b. II only
c. III only
d. I and II only
e. I and III only

anonymous · Answer

$$(2+i)^2=(2+i)(2+i)=(4-1)+(2+2)i=3+4i$$

anonymous · Answer

so II is good

anonymous · Answer

try and see if you get the same with $(-2-i)^2$

karinamtz0213 · Answer

okay thank you :)

anonymous · Answer

satellite can you help me http://openstudy.com/study#/updates/52044441e4b010d6e9b34027