Question

A charitable fund's balance is modeled by y = -4.1x2 + 7.1x + 145, where y is the balance and x is the years after 1996. If no money is added to the fund, in how many years will the fund have a balance of 0? Round to the nearest year.

Answer 1

solve
\[-4.1x^2 + 7.1x + 145=0\]

Answer 2

or if the decimals are annoying, solve
\[41x^2-71x-1450=0\]

Answer 3

ugly answer
http://www.wolframalpha.com/input/?i=41x^2-71x-1450%3D0