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.
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
