SOLUTION: I have tried and i thought that you would lug in 6 for x. but for some reason that doesnt seem right to me. can you please help me. Suppose that N=square root 16+4 models the numb

Algebra ->  Square-cubic-other-roots -> SOLUTION: I have tried and i thought that you would lug in 6 for x. but for some reason that doesnt seem right to me. can you please help me. Suppose that N=square root 16+4 models the numb      Log On


   

Question 136214This question is from textbook Student Solutions Manual
: I have tried and i thought that you would lug in 6 for x. but for some reason that doesnt seem right to me. can you please help me.
Suppose that N=square root 16+4 models the number of cases of an infection, in millions, of a disease x years from now.
In approximately how many years will there be 6 million cases?
This question is from textbook Student Solutions Manual

Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!
No, you need to solve your equation for x, and then substitute 6 for N.

You don't say where x goes in your formula, but I'm going to presume that it goes with the 4 and that both the 16 and the 4 are under the radical, like this:

N=sqrt%2816%2B4x%29

Square both sides:
N%5E2=16%2B4x
4x=N%5E2-16
x=%28N%5E2%2F4%29-4

Now substitute 6 for N and do the arithmetic.