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Need help with this 1 question that has been bugging me all night

  1. Sep 8, 2006 #1
    x to the power of 2 / 60 + x to the power of 4 / 216,000 = 0.001

    How do you figure out what x is?

    i looked up the answer in my book the answer is 0.245 but how did they get that answer?

    please help me someone. :)
     
  2. jcsd
  3. Sep 8, 2006 #2

    Integral

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    What do you know about the manipulation of exponents? Look at your basic definitons, then ask yourself if there is anything that can be factored? For example: is 60 a factor of 216,000?
     
  4. Sep 8, 2006 #3
  5. Sep 8, 2006 #4

    Integral

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    How about you answer my question. Is 60 a factor of 216,000? We know that 2 * 2 = 4 so you can factor the numerator, now do the same with the denominator. Look at and read #3 in your link. Ok, now read it again. How can you use that in your problem?
     
  6. Sep 8, 2006 #5

    radou

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    You can substute x^2 = t, which makes x^4=t^2. Now you can solve the quadratic equation for t, and substitute for x in the end. A bit work with the denominators would be practical too, for the sake of calculation.
     
  7. Sep 8, 2006 #6
    ok so 60 * 3600 = 216,000

    i cant see the connection to how that will help me with this algebra question
     
  8. Sep 8, 2006 #7
    dont understand sorry
     
  9. Sep 8, 2006 #8

    Integral

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    Go ahead and look at the prime factors of 216000.
     
  10. Sep 8, 2006 #9
    let me ask another question that will help me


    2/5 + 1/7 =

    how would you add these two togther manually without a calculator?
    if you can tell me that i will be able to figure out my original problem.
     
  11. Sep 8, 2006 #10

    danago

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    You would need to find a common denominator. You can do that by mumtiplying both denominators together to get a common denominator of 30, but remembering that whatever you do to the denominator, you must also do to the numerator.
     
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