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Whatisthecoefficientof$x4$intheexpansionof$(12x2)5$?

 May 8, 2015

Best Answer 

 #1
avatar+130466 
+11

(1 - 2x^2)^5        

The x^4 term will be

C(5,2)[1]^3 [2x^2]^2  = 10 [1] [ 2x^2]^2  =  [10*4]x^4

So...the coefficient is 40

 

  

 May 9, 2015
 #1
avatar+130466 
+11
Best Answer

(1 - 2x^2)^5        

The x^4 term will be

C(5,2)[1]^3 [2x^2]^2  = 10 [1] [ 2x^2]^2  =  [10*4]x^4

So...the coefficient is 40

 

  

CPhill May 9, 2015

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