curlyheadjay18 curlyheadjay18

19-08-2021
Mathematics

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What's (9+9i)(-1-5i) using foil method

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cheyennetheartist cheyennetheartist

19-08-2021

Answer:

36-54i

Step-by-step explanation:

(9+9i)(-1-5i)

v

-9-9×5i-9i-9i×5i

v

-9-45i-9i-45i^2

v

-9-45i-9i-45×(-1)

v

(-9)-45i-9i+(45)

v

36(-45i)(-9i)

v

36-54i

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