Michael I. answered 03/22/19
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Accredited Master Tutor
Hello Lily
You have: [(-8 + 3i)/(5 + 7i)]*[(5 - 7i)/(5 - 7i)] = (-40 + 56i + 15i - 21i2)/(25 - 49i2) = (-40 + 21 + 71i)/(25 + 49) = (-19 + 71i)/74 = -19/74 + (71/74)i. So the answer is (A).
Sincerely
Michael Imbert