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(10+9i)⋅ ¯¯¯¯¯¯

(10+9i)
Perform the indicated operation & simplify. Express the answer in terms of i (as a complex number). The second (10+9i) is supposed to be under the bar.

1 answer

multiply by conjugate top and bottom, giving

(10+9i)(10+19i)
--------------------- = (19+180i)/181
(10-9i)(10+9i)
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