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what does it mean if the function has a stationary point?

Stationary point means the derivative of that function is zero.

oh... you already said that lol

Did you find b already or not?

Nope, not yet.

I don't know what to do.

Should I just plug in (2,3) to the function to solve for B?

If so, then I'll get B=-13. But I'm not sure.

this is not just about plugging in values
you need to know what you're doing and why you're doing it

Yeah, that's why I am asking how to do it. :)

You should start with taking the derivative, set it equal to zero

how should not be the point of interest

Okay, I'll show my work.

set x=-2 and f(x) =3

^ that's what I did to find B.

|dw:1442978733930:dw|

Hmm..I don't think you can just leave out B

we know that in a graph
|dw:1442978750479:dw|

a and b are constants...

@Jhannybean Well, B is a constant. SO the derivative is 0.

Oh, didn't see the derivative sign in your function, m'bad.

You didn't? That's fine. :D

^ I did that and I got -13.

just like what I said a while ago :D

Okay, then you are good to go :)

Awesome! Thanks for the help though! :)

Anytime!