Question

Between 1989 and 1998, the population of Smalltown USA (in thousands) can be modeled by f(x)= 0.35x^(2)-2.1x+11.2 where x=0 represents 1989. Based on this model in what year did the population of Smalltown reach its minimum

Answer 1

is there a formula i can use?

Answer 2

f'(x): 0.7x-2.1=0
x=3

Answer 3

When f'(x) = 0 f(x) reaches extrema.