SOLUTION: The number of people infected after t days is P = 200 + 5t - t2. Find the number of days until the number of people infected is 176.

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Question 188301: The number of people infected after t days is P = 200 + 5t - t2. Find the number of days until the number of people infected is 176.
Answer by Mathtut(3670) About Me  (Show Source):
You can put this solution on YOUR website!
so P=176.....plug in and solve for t
:
176=200%2B5t%2Bt%5E2
:
t%5E2-5t-24=0
:
%28t-8%29%28t%2B3%29=0
:
t=8 and -3
:
since we cant have a negative time
:
t=8 days