Question

A = 100(1+r)^4

Expand the right of this formula.
appreciate your help with an explanation

Answer 1

100r^4 + 400r^3 + 600r^2 + 400r + 100

Explanation:

Expanding ( r + 1 )^4 gives :-

r^4 + 4r^3 + 6r^2 + 4r + 1

So multiplying 100 with r^4 + 4r^3 + 6r^2 + 4r + 1 gives :-

100r^4 + 400r^3 + 600r^2 + 400r + 100