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What is a - 2b, where a= 4 - 2i + 7 and b = 3 + 2i - 5i?

 Apr 14, 2022

Best Answer 

 #3
avatar+2455 
+1

Substituting for the values of a and b we get: \((4-2i+7)-2(3+2i-5i)\)

 

Simplifying, we get: \(\color{brown}\boxed{4i+5}\)

 Apr 14, 2022
 #1
avatar+578 
+1

a - 2b

 

(4 - 2i + 7)+2(3+2i-5i)

 

17-8i

 

-Vinculum

 

smileysmileysmiley

 Apr 14, 2022
 #4
avatar+61 
-2

I think you subtract, not add

qjin27  Apr 14, 2022
 #6
avatar+2455 
+1

Wait, isn't it a -2b...

BuilderBoi  Apr 14, 2022
 #8
avatar+578 
+2

Yep it was an error on my side

 

Thanks for catching it guys!!!!

 

smileysmileysmileysmileysmileysmiley

Vinculum  Apr 14, 2022
 #2
avatar+61 
-2

You can just assume i as a variable, because you can't really do anything with it

 Apr 14, 2022
 #3
avatar+2455 
+1
Best Answer

Substituting for the values of a and b we get: \((4-2i+7)-2(3+2i-5i)\)

 

Simplifying, we get: \(\color{brown}\boxed{4i+5}\)

BuilderBoi Apr 14, 2022
 #5
avatar+578 
+2

Wait BuilderBoi

 

Who is right?

Vinculum  Apr 14, 2022
 #7
avatar+2455 
+1

I think I solved for a - 2b, and you solved for a + 2b

BuilderBoi  Apr 14, 2022

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