Question

If u = 1 + i and v = 1 – i, what is u + v?
A.2
B.0
C.-2i
D.-2
E.2i

Answer 1

2

Explanation:

Remark

Treat that i as though it were any letter used as variable. The fact that it represents the square root of minus 1 is not an issue here. If you have 5x -5x the result is 0.

Same thing with this question

u + v = 1 + i + 1 - i = 2 The two "i"s cancel and the two "1"s add. The answer is 2

Answer 2

2

Explanation:

u = 1+i

v = 1-i

add them together

1+i

1-i

------

2 +0