Question

Simplify: (2+3i)+(2-3i)
A. 5
B. 4+6i
C. 4
D. 11

Answer 1

Just add and subtract like normally, dropping the parentheses we get, 2+2 = 4, 3i-3i = 0, so therefore your answer is 4.

Answer 2

by using difference square formula :
(a+b)(a-b) = a^2 - b^2

so, (2+3i)+(2-3i) = 2^2 - (3i)^2 = 4 - 9i^2 = 4 - 9*(-1) = 11
since that i = sqrt(-1) then i^2 = -1

Answer 3

I don't think i is treated here as a imaginary number, just a variable. As you can see from the given options :p

Answer 4

Oh wait hold on, you're right o_O, it should be 11.

Answer 5

no, im wrong...
damn, i saw mistake in the question. it is (2+3i)+(2-3i) not (2+3i)(2-3i)
haha :v

Answer 6

Ahaha alright, I started thinking that soon as you posted that as well >_>

Answer 7

bleh lol

Answer 8

Thanks for checking though!