SOLUTION: What is the simplest form of the expression 7i( −3i) + 9?

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Question 1171980: What is the simplest form of the expression 7i( −3i) + 9?
Answer by ikleyn(52778) About Me  (Show Source):
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    = 21*i^2 + 9 = -21*(-1) + 9 = 21 + 9 = 30.    ANSWER