+0  
 
0
78
1
avatar

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

 May 3, 2022
 #1
avatar+9459 
+1

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

 

\(\quad Q\times E \times D\\ = (11- 5i)(11i)(2i + 3)\\ = (121i - 55i^2)(2i + 3)\\ = (55 + 121i)(2i + 3)\)

 

Can you expand the rest?

 May 3, 2022

30 Online Users