Question 213435
You need to remember that (a-b)(a+b) = a^2-b^2
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Divide: (4 + 2i)/ (4 – 2i) 
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Multiply numerator and denominator by 4+2i to get:
(4+2i)^2/(4^2-(2i)^2)
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Simplify:
[16 + 16i + (2i)^2]/ [16+4]
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[16 +16i -4]/20
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[12+16i]/20
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[4(3+4i)]/20
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(3+4i)/5
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Cheers,
Stan H.