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What is the coefficient of x^3 in the expansion of (x + 2*sqrt(5))^7?

 May 27, 2021
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The  coefficient  of  the  x^3   term  is  given  by

 

C (7, 4)   (x)^3 ( 2sqrt 5)^4   =

 

35  x^3   ( 16 * 25)   =

 

14000 x^3

 

 

cool cool cool

 May 27, 2021

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