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Which of the following is a conjugate for -10 + 3i?

-10 - 3i

3i - 10

3i + 10

10 - 3i
 Sep 29, 2013

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 #1
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The first one because when you times them together you get a real number.
(-10 + 3i) (-10-3i) = 100 + 9 = 109
 Sep 29, 2013

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