SOLUTION: N=x^ +2 this models the number of cases of an infection in millions of a disease x represents the number of years how do I solve for how many years will there be 7 millon case

Question 178546: N=x^ +2
this models the number of cases of an infection in millions of a disease x represents the number of years how do I solve for how many years will there be 7 millon cases
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!

I presume you mean the model to be

('^' does not mean 'squared', it means 'raise to the power of' and you have to specify the power. If you mean squared, then you need to write 'x^2' Ok?)

Substitute 7 for N:

Add -2 to both sides:

Take the positive square root:

years.

That is the exact answer. A numerical approximation is two years, two months, and 25 days.

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