vandever
vandever vandever
  • 03-01-2018
  • Mathematics
contestada

If (a+bi)^2=2abi, what must be the relationship between a and b? Show or explain your reasoning.

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wizard123
wizard123 wizard123
  • 03-01-2018
[tex](a+bi)^2 =(a+bi)(a+bi)= a^2 +2abi+b^2 i^2 \\ \\ i^2 = -1 \\ \\ (a+bi)^2 = a^2-b^2 +2abi = 2abi \\ \\ a^2 -b^2 = 0 \\ \\ a^2 = b^2 \\ \\ a = b[/tex]

For the statement to be true, 'a' and 'b' must be equal

*First expand the binomial using FOIL, then set it equal to whats given "2abi".
Then you can find the relationship between a and b.
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