Calculus: Derivative


by MarcAlexander
Tags: calculus, function
MarcAlexander
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#1
Oct8-11, 05:44 PM
P: 45
1) f(x)=3x2-7x+5
2) [itex]\frac{f(x+h)-f(x)}{h}[/itex]

What is the value of equation 2?

NOTE: I'm new to Calculus. I'm trying to self teach by using the internet.

Thanks in advance. ;)
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LCKurtz
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#2
Oct8-11, 05:56 PM
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Quote Quote by MarcAlexander View Post
1) f(x)=3x2-7x+5
2) [itex]\frac{f(x+h)-f(x)}{h}[/itex]

Is equation 2 equal to -7?
No, it isn't. It will have x's and h's in the expression.
MarcAlexander
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#3
Oct8-11, 06:04 PM
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Quote Quote by LCKurtz View Post
No, it isn't. It will have x's and h's in the expression.
May I inquire what the answer is?

Ray Vickson
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Oct8-11, 06:32 PM
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Calculus: Derivative


Quote Quote by MarcAlexander View Post
1) f(x)=3x2-7x+5
2) [itex]\frac{f(x+h)-f(x)}{h}[/itex]

What is the value of equation 2?

NOTE: I'm new to Calculus. I'm trying to self teach by using the internet.

Thanks in advance. ;)
2) will contain both x and h. If you mean the LIMIT as h --> 0, then that would contain only x. Even so, its value would depend on what value of x you choose.

If you show us your work we can make more meaningful comments.

RGV
iRaid
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#5
Oct8-11, 07:44 PM
P: 542
The answer is 6x-7 to help you, but show what you did so people can tell you what is wrong.
MarcAlexander
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#6
Oct9-11, 03:15 AM
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Quote Quote by iRaid View Post
The answer is 6x-7 to help you, but show what you did so people can tell you what is wrong.
Would another form of 6x-7 be ?

That number is the result myalgebra.com calculated.
Ray Vickson
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#7
Oct9-11, 02:08 PM
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Obviously not: one expression has x alone, while the other has both x and h.

Rather than trying to teach yourself using on-line sources, you would probably do better to read a book on the subject. Some people praise the Schaums Outlines books, but, really, most introductory books could be very helpful to you. There even several free ones available as PDF files; you can find them by doing a Google search for 'free calculus books'.

RGV


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