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

      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 -2j^2 -2j -9j + 3 -2j= 9 - 11j -(2)(-1) +3 -2j = 9 + 2 + 3 -11j - 2j = 14 -13j

      4.

      (21 + 7j) \div 7 = 21 \div 7 + 7j \div 7 = 3 + j

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      Last modified on 20 June 2012, at 19:10