Question

whats the fourth term of (d + 4b)^3

Answer 1

(d +4b)(d + 4b)(d + 4b)

Answer 2

http://output.to/sideway/images/knowledge/mathematics/algebra/001/algebra_apgp_019a.png

Answer 3

so you are doing binomial expansion
Pascal's triangle
(a + x)^n = a^n + n/1*a^(n-1)*x + n(n-1)/2*a^(n-2) + .....x^n

Answer 4

substitute a = d n = 4 and x = 4b