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11 Evaluate d-fif d = 7 and f = -15.
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11 Evaluate d-fif d = 7 and f = -15.

User Phact
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d - fif

d —> 7 and f —> -15

7 - (-15)i (-15)

now simplify to get

7 - 255i
User BaronVonBraun
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