Factoring Complex Numbers- Open Middle Problem

Find Integers a,b,c,d such that:

factoring imaginary numbers

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3 thoughts on “Factoring Complex Numbers- Open Middle Problem

  1. I thought of flogging it out, but even assuming integers 2 to 9 this gave something like 8!/3! combinations. Then I analysed the product (ac – bd) + (ad + bc)I for odd and even. This reduced the choices to about 36, and the result then fell out.
    This is a HARD SUM ! Result 5 2 3 6

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