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#1 2016-01-22 12:29:10
- Mathegocart
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- Registered: 2012-04-29
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Critical Numbers-Help!
Is this the right awnser?
at -5 the result is 0 so I chose that it was a critical point.
and number 2 question is TRUE, edited because undefined./
Last edited by Mathegocart (2016-01-22 12:30:10)
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#2 2016-01-22 17:11:25
- bobbym
- bumpkin
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Re: Critical Numbers-Help!
Hi;
I like - 5 also.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#3 2016-01-22 21:24:39
- Bob
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Re: Critical Numbers-Help!
hi mathgogocart
2nd: If the derivative is undefined at x=1 then it cannot have a critical point there as such points are defined in terms of the derivative.
In your last post you also asked about CPs. From a quick internet search it seems most sites use CP to mean a point where the first derivative is zero. Some also recognise a second order critical point as one where the second derivative is zero.
http://www.mathwords.com/s/second_order … _point.htm
So you need to look at how Khan is defining CPs.
Questions of definition sometimes are open to debate because there is no absolute authority on definitions. I usually check Wolfram, Wiki and Mathword.
Bob
Children are not defined by school ...........The Fonz
You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you! …………….Bob 
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