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jmc

algebra intermediate

Problem

Simplify

5 (3 - i) + 3 i (5 - i)

.

Solution

5 (3 - i) + 3 i (5 - i) = 15 - 5 i + 15 i - 3 i^{2} = 15 + 10 i - 3 (- 1) = 18 + 10 i

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Final answer

18+10i