For the period 1985 - 2001, the average salary y (in thousands of dollars) per season of a Major League Baseball player can be modeled by y = 7x^2 - 4x + 392 where x is the number of years since 1985.
a. Write and solve an equation to find the year when the average salary was $1,904,000.
b. Use a graph to check your solution to part (a).