***AP Calculus AB 2015-2016 Thread***

Great stuff. I really hope mcqs cover up for my careless mistakes on the FRQs lol.

Did the answer to the question with e^(t/2) start with 1/4e…

It’s 1/5th. You’d get 1/2 if you forget to find the derivative at x=2 for F.

Idk but I’m pretty sure it asked to find it at x=-1…

The inverse one?

I believe so… lol

I’m pretty sure it didn’t give you g(5) = 2, or at least it didn’t want you to find it at 2.

What was the tangent line? @Chrysanthemum14

It didn’t want you to find it at 2. It wanted you to find it at some x value on g that produced g’s y value at 2. Then, you had to find the derivative of F with the x value the same as g’s y value, giving 5. Then, 1/ that = 1/5.

Am I absolutely insane or did anyone have an problem where it gave a function f and then g(5)=0

Also, there was a frq question that asked where the particle changes direction and I put at t = 2.7 because that’s where the velocity changed from positive to negative.
Also, on the calculator mcq, there was one question that asked how many points of inflection a graph had, I got 5 points.
For the last mcq question, which asked which choice was false or something, i put the choice that said: there must be x -2<x<3 for which f’(x) = g’(x)

ah yes you solved the problem @johncrosby97 f(0) = 5 and g(5) =0 so what I did was a = 0 and b = 5 g’(5)= 1/f’(0) = 1/2.

@YoohooAddict it wasn’t g(5) = 0.

Okay good hahaha I knew something wasn’t adding up. I still got it wrong I’m pretty sure because I got -1/2 and I have no clue where the negative came from.

If you accidentally did 1/f(g(x)) you would get 1/5.

I’m absolutely positive whichever problem I’m thinking of was g(5)=0 because when you plugged 0 into F you ended up just getting 5. So then 1/f’(0) ended up being the answer

@johncrosby97 Couldn’t have said it much better. That’s exactly what I did when I saw the problem. I knew they were inverses so I did f(0) which = 5. @appgodxoxo

what is that question that the answer is 2e?

@YoohooAddict yep! I got all of those too!

@ywaGGway I got that answer but I don’t know what the original question was lol.