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9i(4+5i) multiply the following

9i(4+5i) multiply the following
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9i(4+5i) multiply the following

User Sarang Amrutkar
by
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1 Answer

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Recall that i^2 = -1.

9i(4) = 36i, and 9i(5i) = 45(-1) = - 45.

Thus, the desired product is -45 + 36i.
User Yottagray
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