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Mathematics 9 Online
OpenStudy (iwanttogotostanford):

@3

OpenStudy (3mar):

ok what is your choice?

OpenStudy (iwanttogotostanford):

C based off my work.. what you think

OpenStudy (3mar):

Let's agree that that is a quadratic equation comes from a cubic equation, ok?

OpenStudy (iwanttogotostanford):

yes

OpenStudy (iwanttogotostanford):

@3mar

OpenStudy (iwanttogotostanford):

@3mar

OpenStudy (3mar):

Sorry, I was not online! Do you still need help?

OpenStudy (iwanttogotostanford):

@3mar

OpenStudy (3mar):

I am here, thinking about that confusing problem!

OpenStudy (iwanttogotostanford):

@3mar

OpenStudy (iwanttogotostanford):

hello?? @3mar

OpenStudy (3mar):

Yes I saw it! delete it please!

OpenStudy (iwanttogotostanford):

ok! are you working on the problem?

OpenStudy (3mar):

Yes. for sure statement I is not correct. are you agree?

OpenStudy (iwanttogotostanford):

yes!

OpenStudy (iwanttogotostanford):

so that leaves us between choice B and C

OpenStudy (3mar):

what about D?

OpenStudy (3mar):

what is D?

OpenStudy (iwanttogotostanford):

I and III only so its not right.

OpenStudy (3mar):

Yes, D is not right!

OpenStudy (3mar):

Yes B or C, but let me pick the correct one! Time for pray - 45 min - Salam!

OpenStudy (iwanttogotostanford):

ok- please come bacK!!!

OpenStudy (iwanttogotostanford):

@jim_thompson5910 can you finish up please?

OpenStudy (3mar):

I am back!

OpenStudy (iwanttogotostanford):

@3mar ah thank yoU!

OpenStudy (3mar):

No problem at all! I think C, but I want to be sure 100%

OpenStudy (3mar):

In mathematics, a critical point is any value in its domain where its derivative is 0. agree with me?

OpenStudy (iwanttogotostanford):

and yes i agree

OpenStudy (3mar):

An inflection point is a point on a curve at which the sign of the curvature (i.e., the concavity) changes.

OpenStudy (iwanttogotostanford):

so it is C or no??? @3mar

OpenStudy (3mar):

Involve yourself making the decision of this with me!

OpenStudy (iwanttogotostanford):

@3mar

OpenStudy (3mar):

ok I will confirm

OpenStudy (3mar):

No problem.

OpenStudy (3mar):

of course I read about it now

OpenStudy (iwanttogotostanford):

ok

OpenStudy (iwanttogotostanford):

hello?? please!

OpenStudy (iwanttogotostanford):

@3mar !

OpenStudy (3mar):

This is the first derivative. https://www.desmos.com/calculator/i5tpbxgllj and that is the function itself! https://www.desmos.com/calculator/15ywomf9gm I got it now All praise is due to Allah! This function has only an inflection point at x=2 because the concavity of the original function f(x) changes at this point, not a critical point (at x=2 the slope does not equal to zero nor undefined)!

OpenStudy (3mar):

How it is still C,,,did not understand my point??????????

OpenStudy (iwanttogotostanford):

which letter is it?? yes i did

OpenStudy (3mar):

Look at the graph I sent! https://www.desmos.com/calculator/rcwi7kxocm the red curve represents the function f(x), and at x=2 the concavity changes, so at x=2 there is a point of inflection, not a critical point!

OpenStudy (3mar):

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