Problema Solution
The nimber y visitors to Dragon Lake State park between 1984 and 1992 can be approximated by model y=172.35x^2-303.4x+6972, where x=0 corresponds to 1984. Based on model, in what year did the park have about 8500 visiters?
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The nimber y visitors to Dragon Lake State park between 1984 and 1992 can be approximated by model y=172.35x^2-303.4x+6972, where x=0 corresponds to 1984. Based on model, in what year did the park have about 8500 visiters?
8500=172.35x^2-303.4x+6972=0.
1723.5x^2-303.4x-1528=0.
Solve the above quadartic equatioin.
x=4 or -2.22
neglect negative value.
The year did the park have about 8500 visiters =1984+4 =1988.