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Question

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iwanttogotostanford · Answer

^^

tkhunny · Answer

Can you speculate as to the DEGREE of each function?

iwanttogotostanford · Answer

@3mar helo! you are back!! please help!

3mar · Answer

Yes, I am back.
I was praying!

iwanttogotostanford · Answer

oh i understand! :-)

tkhunny · Answer

Answer my question and you will be sure.

iwanttogotostanford · Answer

I think it is A, can anyone confirm 100% @SolomonZelman ?

tkhunny · Answer

So, you're not going to answer my question?

iwanttogotostanford · Answer

you're not answering mine! i said is it A?

iwanttogotostanford · Answer

@steve816 A?

tkhunny · Answer

I already know the answer.  You need to tools to reason it out.  Answer my question and you will have the tools to answer with no doubt.

iwanttogotostanford · Answer

the degree of each function is 2 and 0.2

tkhunny · Answer

"A" looks pretty straight to me.  Degree 1, maybe?

iwanttogotostanford · Answer

yeah... the answer cannot be determined!

tkhunny · Answer

Okay, how about the minimum degree for B?

iwanttogotostanford · Answer

uhh isnt it already solved?? the answer can't be determined!

tkhunny · Answer

Again, answer my question and you will have no doubt.

iwanttogotostanford · Answer

min degree for b is 0

tkhunny · Answer

Not so.  Have you ever seen a degree zero function (constant) turn around twice?

iwanttogotostanford · Answer

no! thats why i think it is not determined!

tkhunny · Answer

So, what degree is it - at least?

iwanttogotostanford · Answer

2

tkhunny · Answer

That would be a parabola.  Does it look like a parabola?

iwanttogotostanford · Answer

no.

tkhunny · Answer

You're so focused on the answer, your not thinking about how to find it.  What is the minimum degree of B?

Degree 1 turns around 0 times
Degree 2 turns around 1 time
Degree 3 turns around potentially 2 times
Degree 4 turns around potentially 3 times

an we agree that it must be AT LEAST degree 3?

tkhunny · Answer

* Can

iwanttogotostanford · Answer

Yes..!

tkhunny · Answer

I'd stay if you would answer my questions.

Given a polynomial function, how many degrees do we lose when we take a derivative?

iwanttogotostanford · Answer

2

tkhunny · Answer

??  Polynomial rule?

$\dfrac{d}{dx} x^n = nx^{n-1}$

How many degrees did we lose?

iwanttogotostanford · Answer

3

tkhunny · Answer

We started with "n", and we ended with "n-1".  How many degrees did we lose?

iwanttogotostanford · Answer

1

tkhunny · Answer

That's the spirit.

So, if B is degree 3, and A is degree 1, that is a drop of TWO degrees.  Can A be the derivative of B?

iwanttogotostanford · Answer

no!

tkhunny · Answer

We just determined it.

tkhunny · Answer

So much for answer A.

iwanttogotostanford · Answer

oh wow you're right!

iwanttogotostanford · Answer

so C correct? because they aren't equal each other

tkhunny · Answer

There it is, then.  Clearly, also, going UP two degrees, B cannot be the derivative of A.

iwanttogotostanford · Answer

so confirm it is C? you were a big help by the way thank you !

tkhunny · Answer

It took a little patience from both of us.  It's a worthwhile lesson.  Good work.

iwanttogotostanford · Answer

thank you:-) you too! do you by chance know any spanish??

tkhunny · Answer

Ha.  Finnish, not Spanish.

iwanttogotostanford · Answer

are you from finland?

tkhunny · Answer

No.  Spent some time there a long time ago.  Its pretty rusty.  :-)  gtg  Stay awesome.

iwanttogotostanford · Answer

ah cool, thanks!