How can you simplify the expression 7 plus 8j plus 7-2j?

Answer 1

Re-write it properly first, in all-algebraic language:

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7 + 8j + 7 -2j

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Now put like terms together:

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7 + 7 +8j - 2j

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Then simplify by doing the arithmetic:

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14 + 6j.

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And there you are!