Question #d9b53

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Question #d9b53

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Answer 1 · 2018-02-17T21:55:08

#(k + 3i)(1 - 7yi) = (k + 21y) + (3 - 7ky)i#

Explanation:

Cross multiply, simplify and group

#(k + 3i)(1 - 7yi) = k + 3i -7kyi -3i*7yi#
#(k + 3i)(1 - 7yi) = k + 3i -7kyi -21*(-1)*y#
#(k + 3i)(1 - 7yi) = k + 3i - 7kyi + 21y#
#(k + 3i)(1 - 7yi) = (k + 21y) + (3 - 7ky)i#

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Question #d9b53

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