The concentration of a medicine, f(x) in parts per million, in a patient's blood X hours after the medicine is taken is given by the function

Question

f(x)= -x^4 +12x^3 -58x^2 +132x.

1.) How many hours after the medicine is taken will it be eliminated from the bloodstream?

2.) What will be the level of medicine in the body after 1, 2, 3, 4, and 5 hours?
For question 2, do I just plug in 1, 2, 3, 4, and 5 separately into the function given above and solve for each so I would get 5 answers??

Answer 1

Yes

Answer 2

Did you get #1 ?