Calculus is eating me up right now and I could use all the help I can get. I'll be posting problems in here during this semester with the hopes that you guys can help me.

Here is my first problem:

5(3)^ln 3 - 5(2)^ln 2 / 1

I know that the answer is: 8.6323, but how?

This is in regards to instantaneous change.

looks like you're asking an arithmetic question? just use a calculator.

you can simplify a little first
5(3)^ln 3 - 5(2)^ln 2 / 1
5(3)^ln 3 - 5(2)^ln 2
5 * (3^ln3 - 2^ln2)
~= 5 * (3.3433 - 1.6168)
~= 8.6323


if it came out to an integer or simple fraction there might be some ln rules you can apply. but considering the ugly decimal, i dont think so.

Ok I am trying to evaluate derivatives on my TI-84 Plus. I've never used a graphing calculator until this class.

I have watched numerous youtubes on how to do this on the calculator but my calculator is not pulling up the function that I need.

When I go to math > option 8 nDeriv( it is giving me this: d/d_ (_) l □=_

I need it to look like: nDeriv( so I can enter the equation in.

Is there a setting I need to set in order to do this?

edit: nevermind I figured it out in that format. But it would still be nice to know how to change that format.

This post was edited by Dune1 on Feb 5 2015 08:24pm

Yeah I figured that format out. However, in youtube, there are many TI-84 Plus calculators that format the nDeriv differently and I would of like to use it that way. However, it doesn't matter at this point.

Thanks!

If you're taking Calculus at university level it would be in your best interest to not rely on a calculator for derivatives.
Unless it's for some outrageous function, they aren't hard to learn. And judging by your questions this is Calc 1?

Don't use a calculator at all unless your possibly checkin your own solution, when I was getting my bachelors in mathematics and started graduate school I found out I was light years ahead of others in my program bc when I learned calc 1-3 my professor didn't allow calculators at all which meant we rigorously learned the material. Basic calculus is generally just a lot of algebra anyways and once you understand calculus is just basically studying rates of change it becomes much easier to understand. If you need any help toss me a pm.

exactly. Get to know calculus before you use a calculator. The basics will get used again, so you have to have a strong grasp befoer you move on

I haven't taken math in years. Really struggling with this class. I'm taking Calculus for Business and Social Sciences, so it's a lot of profit, cost, revenue, etc..





I'm pretty dependent on a calculator. Why should I manually divide 4539 by 3839 when I have a calculator?


Oh and I need help solving this problem. I am absolutely TERRIBLE with fractions.



This too. Do I solve this using the instantaneous formula?



This post was edited by Dune1 on Feb 10 2015 10:02pm

f'(x) = -6 / x^2

f'(1) = -6 / 1^2 = -6
f'(2) = -6 / 2^2 = -1.5
f'(3) = -6 / 3^2 = -2/3

This post was edited by obisent on Feb 10 2015 11:06pm