Sunday

April 20, 2014

April 20, 2014

Posted by **Ron** on Friday, January 27, 2012 at 4:21pm.

If f(x)=3x^2+7x+2, find f'(4) , using the definition of derivative.f'(4) is the limit as x--> ________ of the expression __________________. The value of this limit is _________________. I've got the first part that f'(4) is the limit as x--> 4, but I'm not sure what expression the second part is asking for. I can't find any examples and it's an online program, so I'm not sure if I got the answer and just didn't enter it correctly or I'm completely off. I'm pretty sure I can get the rest of the problem. Just need some help with the second part.

- calculus -
**Damon**, Friday, January 27, 2012 at 5:19pmwell, first I will giver the answer

6 x + 7

now

3 (x+h)^2 + 7(x+h)

3 x^2 + 6 x h + 3 h^2 + 7 x + 7 h

3 x^2 + 7 x + 2

---------------------------- subtract

6 x h + 3 h^2 + 7 h

divide by h

6 x + 3 h + 7

limit as h --> 0

6 x + 7 amazing

**Related Questions**

Algebra - Checking two problems : 1. x^2-7x+12 / x^2-16 = (x-3)(x-4) / (x-4)(x+4...

math - sorry heres the whole question having troulbe with this on can you show ...

Math - I have 4 math problems that need to be solved by using factoring. I am ...

Algebra - I got a couple I want to check my work : Both are Solve using the ...

Math - Simplify. (5x2 + 3x - 7) - (x2 - 7x + 4) Simplify. (5x^2 + 3x - 7) - (x^2...

Calculus - I'm having problems with this one. Can't get the right answer. ...

calculus - I'm having trouble with these two problems. If someone can help me ...

Math - Can someone please check my answers below for accurateness? The ...

Pre-algebra - Could someone please help me solve the following problems, and ...

Pre-Calculus - I'm having problems understanding how to do these problems. 25. ...