An account grows at an annual interest rate of r , so it grows by a factor of x=1+r each year. The function A(x)=800x4+ 350x3+ 500x2+ 600x gives the amount in the account after 4 years when the growth factor is x .After 5 years, $200 is added to the account. Use the expression for to write a new expression that represents how much is in the account after 5 years.