+0  
 
+1
309
3
avatar+2448 

Please help >.<

 Apr 3, 2018
 #1
avatar+111329 
+3

a +  bi   is  ⇒    Complex

 

 

 

(6 + 5i)  ( 3 - 7i)  =

 

6 (3 - 7i)  +  5i (3 - 7i)  =

 

18 - 42i  + 15i   - 35i^2          (remember that i^2  = -1)....so we have

 

18 - 27i - 35 (-1)  =

 

18 - 27i + 35  =

 

53- 27i

 

 

cool cool cool

 Apr 3, 2018
 #2
avatar+428 
+3

#2 is D

 Apr 3, 2018
 #3
avatar+428 
+3

#1 i believe is complex numbers

 Apr 3, 2018

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