Question #d9b53

1 Answer
Lovecraft
Feb 17, 2018

(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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