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If Q = 11 - 5i, E = 11i, and D = 2i + 3, find Q*E*D.

 May 3, 2022
 #1
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You can multiply out just like "i" was a variable instead of sqrt(-1), and then use i^2 = -1 occasionally.

 

Q×E×D=(115i)(11i)(2i+3)=(121i55i2)(2i+3)=(55+121i)(2i+3)

 

Can you expand the rest?

 May 3, 2022

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