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Simplify (1-2i)(1-i)(1+i)(1+2i)

 Jun 26, 2019
 #1
avatar+111396 
+2

(1-2i)(1-i)(1+i)(1+2i)   =

 

(1 + 2i) (1 - 2i) (1+ i) (1 - i) =

 

(1 - 4i^2) ( 1 - i^2)              [ remember that i^2  = - 1  ]

 

(1 - 4(-1) )  ( 1 - (-1) )  =

 

( 1 + 4)  (1 + 1)  =

 

5  *   2    =

 

10

 

 

cool cool cool

 Jun 26, 2019

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