Recent content by zketrouble

  1. Z

    Flipping H/A Fraction for Canceling Out A's

    If you are trying to cancel out the a's, I would multiply both sides of the equation by a. o/a + h/a = 1 (o+h)/a = 1 o+h = 1a o+h = a And if you are using this for a geometery problem, I think there might be an error somewhere. Opposite + Hypotenuse = Adjacent? shouldn't it be B^2 = C^2...
  2. Z

    What is the use of mathematical induction

    Could you give a little more detail about your question? Its a bit too vague for me to understand exactly what you're asking.
  3. Z

    Inflection points theorem for quadratic functions.

    Thanks everybody! I was almost tearing my hair out in wondering the connection.
  4. Z

    I would like to argue about .999

    well Curd, I think I have a way you can understand this plainly. First I'll give a simple formal proof and then a more informal one which seems to follow your thinking strategy against the idea that 0.99999... = 1. Formal but simple proof: (1/3) = (0.333333333...) (1/3)*3 =...
  5. Z

    Inflection points theorem for quadratic functions.

    Thanks for the correction, I always get the two mixed up :p
  6. Z

    Inflection points theorem for quadratic functions.

    Hey all, I was bored as heck with my internet down and started scribbling some random math stuff. I'm sure what I've come up with is old news to most but I found some interesting properties in the following proof and I'm curious what my fellow physicsforums users can come up with to see what...
  7. Z

    What is the Pattern in the Integration of (x^n)(e^x) dx?

    silly me...forgot all of the + c every time. :p
  8. Z

    What is the Pattern in the Integration of (x^n)(e^x) dx?

    so I just introduced myself to the concept of integration by parts a few days ago, and today for practice I decided to try to redo one of the examples given in a youtube video without the assistance of youtube. That problem was int. (x^2)(e^x) dx, for which the answer is (e^x)(x^2 -2x + 2). So...
  9. Z

    Proving Root n is Irrational: Perfect Square Affects Proof

    If a root n is a perfect square such as 4, 9, 16, 25, etc., then it evaluating the square root quickly proves it is rational. The square root of the perfect square 25 is 5, which is clearly a rational number. To prove a root is irrational, you must prove that it is inexpressible in terms of...
  10. Z

    What to do if your professor is not much ''intelligent''?

    Sorry for going off-topic, but out of curiosity, where are you from and what was your first language? Your English is pretty good, its at the same level as my second language (Chinese) and I've been studying for 12 years.
  11. Z

    Is College a Rip Off? - John Stossel & Physics Majors

    I don't think it is college's responsibility to find you a job. One has to be dedicated and search for him/her-self, check his options, show that he/she is a confident individual who can be of use to an employer. Gainful employment rules have some good behind them though. I do think college...
  12. Z

    What to do if your professor is not much ''intelligent''?

    So it sounds like you've stated your concerns to this teacher before. So now you can be pretty sure nothing will come from reasoning with her, so I would contact the dean of physics or dean of student services, or really any administrative body that can overrule any of her bad decisions.There's...
  13. Z

    Evidence that the Universe is Expanding?

    Hi all, First let me say that I'm not an astrophysicist but that I have some understanding of classical physics. So it has been said that the universe is expanding, but what evidence is there of this other than the fact that things seem to be drifting apart? Since much of the universe is...
  14. Z

    What to do if your professor is not much ''intelligent''?

    micromass: I agree, acting as a group as opposed to individually is much more effective. And as Shackleford said you better be pretty sure you're right before making accusations, esp. if you want anybody to take you seriously ever again. You started the forum insinuating that your...
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