A-level Mathematics/MEI/FP1/Complex Numbers/basic operations solutions

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1.

5j+3j=(5+3)j=8(j)=8j

2.

7(3j)=(7)(3)(j)=21(j)=21j

3.

(9+2j)(1−j)+3−2j=9−2j2−2j−9j+3−2j=9−11j−(2)(−1)+3−2j=9+2+3−11j−2j=14−13j

4.

(21+7j)÷7=21÷7+7j÷7=3+j

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