# Math

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Use of the Internet in a country is given by the function f(x)=0.485x^2-1.694x+0.315, where the output is in millions of users. In this formula x=6 corresponds to 1996, x=7 corresponds to 1997, and so on until x=20 corresponds to 2010. Estimate when the number of Internet users in the country reached 13 million.
The number of Internet users in the country reached 13 million during the year?

• Math -

F(x) = 0.485x^2 - 1.694x + 0.315 = 13.

0.485x^2 - 1.694x - 12.685 = 0,
X = 7.15 Which corresponds to 1997.
Therefore the number of Internet users reached 13 million in 1997.

Use Quadratic Formular to solve Eq.

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