The following table shows the crude steel production in the​ USA, in millions of metric tons. 1980 0 80
1985 5 90
1991 11 91

​(A) Find a quadratic function ​f(x) that fits the​ data, where x represents the number of years after 1980.
​f(x) X^2+20833x+80
nothingxx80.
​(Round to three decimal places as​ needed.)