# PreCal

Write the expression (7 – 7i) + (–8 – 2i) in the form a + bi

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1. Combine the whole numbers and the i's

(7+-8) + (-7i+-2i)

=-1+-9i

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2. Alison,

Could would you tell me if the problem listed below is correct:

(4+5i)(4-5i)=
16+-i

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