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When (a + bx)^5 is expanded, the coefficient of x^4 term is 8 terms the coefficient of x^2.  If a and b are positive integers, then find a/b.

 Aug 30, 2020
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a =1    and     b =4

 

Expand   (1 + 4x)^5

 

1024 x^5 + 1280 x^4 + 640 x^3 + 160 x^2 + 20 x + 1

 

a/b = 1/4
 

 Aug 30, 2020

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