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JakeV8Best ResponseYou've already chosen the best response.1
why yes, I would be happy to :)
 one year ago

imron07Best ResponseYou've already chosen the best response.0
3b), did you just use negative 500 mg for I(t)?
 one year ago

JakeV8Best ResponseYou've already chosen the best response.1
yes, it needs to have been 500 = 3t^2 + 126t
 one year ago

JakeV8Best ResponseYou've already chosen the best response.1
try quadratic formula again with 0 = 3t^2 + 126t  500
 one year ago

JakeV8Best ResponseYou've already chosen the best response.1
http://www.wolframalpha.com/input/?i=500+%3D+3t^2%2B126t Ibuprofen level starts at zero, take a pill, levels increase past 500, peak, and drop back below 500. The points the quadratic formula produces are the t values that go with the I(t) levels of 500
 one year ago

JakeV8Best ResponseYou've already chosen the best response.1
Start your set up by saying I(t) = Ibuprofen level at time t after taking pill. I(t) = 3t^2 + 126t when is I(t) = 500? I(t) = 500 = 3t^2 + 126t 0 = 3t^2 + 126t  500 then use quadratic formula. Result is 2 t values which are possible times after taking pill before I(t) level of ibuprofen is equal to 500. The problem asks for the longest time, so you would need to select the larger t value.
 one year ago

JakeV8Best ResponseYou've already chosen the best response.1
consolation prize... you had part (a) correct :)
 one year ago

hiralpatel121Best ResponseYou've already chosen the best response.1
So 3(a) is correct and I have to fix 3(b)?
 one year ago

JakeV8Best ResponseYou've already chosen the best response.1
I think prob 4 is right too.
 one year ago

JakeV8Best ResponseYou've already chosen the best response.1
ugh bad laptop! Yes, 3b needs fixing, but you were close... just set up I(t) = 500, put in the expression for I(t), subtract 500 from both sides to get 3t^2 +126t  500 = 0, and then use quadratic formula
 one year ago

hiralpatel121Best ResponseYou've already chosen the best response.1
Okay, thank you!
 one year ago

JakeV8Best ResponseYou've already chosen the best response.1
you just jumped into it too fast and put the 500 on the wrong side.
 one year ago

JakeV8Best ResponseYou've already chosen the best response.1
Always glad to help... I am really really really really really love the fact that you try these problems first and then post them for us to talk through... that is how this site is SUPPOSED to work!!
 one year ago

JakeV8Best ResponseYou've already chosen the best response.1
Now I have to get going though :) see you next time :)
 one year ago

hiralpatel121Best ResponseYou've already chosen the best response.1
See you next time :) Thank you so much :)
 one year ago
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