# Using Mathematica

• Jun 5th 2012, 06:23 PM
ImaginaryMe
Using Mathematica
Hello,

I am working on a physics extended essay, I am currently doing the theoretical part, which is quite complicated mathematically. I'm using wolfram mathematica software.
I have an equation in terms of x with the following input:

y == Integrate (0.0024185/(2500/((0.485*x - 3.331) - (8.3168*x^4)/10^11)))

and i want to find this in terms of y.
I looked up how to do his online but the methods described don't work (Solve[f, x]), it integrates it but it won't give me an answer in the form of x=... . It's my first time using mathematica and I barely have any idea how this program works.

Could someone show or explain how to do this operation on Mathematica?
Thank you.

(here is the rather complicated integration btw:
0.03570564892972396ArcTan[13.183814302621965(-0.02483697240551654+0.00013909425548185503x)]-0.05903035199689583ArcTan[21.331857030862427(0.06433278065113979" "+0.000139 09425548185503x)]-0.03055575323444802Log[4.793272842237218" "-0.008339492055330919x]+0.025050646588548966Log[22.8988109751016" "-0.02483697240551654x+0.00006954712774092751x^2]-0.009772769971324955Log[22.776916307094982" "+0.06433278065113979x+0.00006 954712774092751x^2]
)
• Jun 7th 2012, 09:14 AM
BillSimpson
Re: Using Mathematica
I think something must be getting lost in the translation here.

In[1]:= Simplify[0.0024185/(2500/((0.485*x-3.331)-(8.3168*x^4)/10^11))]

Out[1]= -3.2224094*^-6 + 4.69189*^-7*x - 8.04567232*^-17*x^4

In[2]:= Integrate [%,x]

Out[2]= -3.2224094*^-6*x + 2.345945*^-7*x^2 - 1.6091344640000002*^-17*x^5

Since that is so different from your integration I have to think there must be some error in the transmission. If you can check the details and clarify the explanation of the problem then perhaps we can get you where you need to go.

The Simplify[] step isn't actually necessary. I first just did the integration, saw the result was so different and then went back and did the simplification to see if I had missed something. Your input appears to be a simple polynomial in disguise.
• Jun 11th 2012, 08:22 AM
ImaginaryMe
Re: Using Mathematica
Hello BillSimpson, thank you for replying.
Sorry I didn't reply for a while, I wanted to discuss this with my physics teacher.

Attachment 24063

I forgot to put a parenthesis somewhere in the other equation.

Anyway, do you know how I would find the x solution to this?

The WolframAlpha representation of the integral:
0.0024185/(2500/((0.485*x - 3.331)) - (8.3168*x^4)/10^11))dx - Wolfram|Alpha
• Jun 12th 2012, 10:16 AM
BillSimpson
Re: Using Mathematica
Your parentheses still do not match up in this
0.0024185/(2500/((0.485*x - 3.331)) - (8.3168*x^4)/10^11))dx