Q15. Complex numbers
Explanation
(5 + 12i) - (9i2 - 6i)
5 + 12i - 9i2 + 6i
5 + 12i - 9(-1) + 6i
5 + 12i +9 + 6i
14 + 18i
Lesson
With addition / subtraction of complex numbers, you’re being tested on whether you can match like terms.
In addition, you need to know the values of i
√ - 1 = i
-1 = i2
- √ - 1 = i3
1= i4