A-level Mathematics/MEI/FP1/Complex Numbers/solutions to powers of j questions

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1.

 j^9 = (j^5)(j^4)=(j)(1)= j

2.

 j^{22} = (j^4)(j^4)(j^4)(j^4)(j^4)(j^2)=(1)(1)(1)(1)(1)(j^2)=j^2 = -1

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