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16-06-2017
Mathematics

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

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ghanami ghanami

27-06-2017

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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