Math Is Fun Forum

CIV

Member

Registered: 2014-11-09

Posts: 74

Please help me. Difference Quotient.

I am studying and came across this problem:

The book says this is the answer but for the life me I can't figure out how they got this answer. I plugged the equation into wolfram alpha and the answer it produced wasn't that of the book either.

This is what I worked out:

This is as far as I can get:

If someone can help me that would be great. I have been trying for 45 minutes now.

Last edited by CIV (2015-02-08 15:41:47)

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Please help me. Difference Quotient.

Hi;

3 + h is correct . Your 3rd line should be (h^2 + 3h) / h.

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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.

CIV

Member

Registered: 2014-11-09

Posts: 74

Re: Please help me. Difference Quotient.

Yea. My teacher emailed me back (which is pretty surprising) with the correct way of doing it. I didn't put the substitution for f(2) in parenthesis. Thanks.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Please help me. Difference Quotient.

Hi;

You are welcome.

---

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.