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

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Q14. Elimination