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Complex Numbers: Addition and Subtraction
2( –6 + j )   –   2( –18 + 4 j ) = + j

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Worked Solution:

Expand the brackets first:
2( –6 + j ) = –12 + 2 j
2( –18 + 4 j ) = –36 + 8 j
Subtract the real parts –12 – (–36)=24
Subtract the imaginary parts 2 j – 8 j= –6 j
The total is therefore 24 – 6 j

AS Further Pure Mathematics (MEI Structured Mathematics FP1) Third Edition (2004) pages 46-50
© MEI Produced by Dr Ron Knott, 16 Feb 2004
tom . button [AT] mei . org . uk 		Test reference: ComplexAddSub.html?ref=29535