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16 February, 13:32

For what real number k does the product (25 + ki) (3+2i) equal a real number?

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  1. 16 February, 15:00
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    Hello:

    (25 + ki) (3+2i) = 75+50i + 3ki - 2k = (75-2k) + i (3k+50)

    the product (25 + ki) (3+2i) equal a real number: 3k + 50 = 0

    k = - 50/3
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