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Simplify the following expression. (10-4i)(4-5i)+(-15+20i)

 Oct 2, 2021
 #1
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(10-4i)(4-5i)+(-15+20i) =

40 - 50i -16i + 20i^2 - 15 + 20i    collect like terms   ( note that i^2 = -1     so + 20 i^2 = -20)

5 -46i

 Oct 3, 2021

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