09-17-2012, 02:56 PM | #1 |
Can't handle my ÆØÅ
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ATTN: Math geniuses
Can anyone solve this and show how you did the equations?
My friend needs help with this. |
09-17-2012, 02:58 PM | #2 |
lol happy
Join Date: Oct 2005
Location: DESTINY
Age: 33
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Re: ATTN: Math geniuses
For the bottom one, I believe you use the identity
Also I can give a general tip for dealing with e: sometimes it's helpful to think of it just as any old number, like say 2.7 Even though e has some special properties especially when dealing with logarithms, treating it as "just a number" can sometimes remind you of ways you can shuffle it around to solve your equation. (this can also be a helpful mindset for working with pi, phi, really any irrational number) Wish I had more time to go in-depth but if nobody else has responded by tonight I'll try to help better
__________________
Last edited by hi19hi19; 09-17-2012 at 03:08 PM.. |
09-17-2012, 03:36 PM | #3 |
D6 FFR Legacy Player
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Age: 33
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Re: ATTN: Math geniuses
For the first one try factoring e^(1/2*x). It should be straightforward from there. I provided a solution in case you managed to work it out.
Second one. I don't understand the question. Is it ln (3*x) or 3 ln x? What is ln x3? |
09-17-2012, 03:39 PM | #4 |
I am leonid
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Re: ATTN: Math geniuses
x3
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09-17-2012, 03:46 PM | #5 |
x'); DROP TABLE FFR;--
Join Date: Nov 2010
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Re: ATTN: Math geniuses
but srsly: e^x - 2e^(.5x) = 0 e^x = 2e^(.5x) e^x/(e^(.5x)) = 2 e^(.5x) = 2 .5x = ln(2) x = 2ln(2) Assuming the second question's rhs is actually ln(3x) 4 - ln(x^3/3) = ln(3x) 4 = ln(3x) + ln(x^3/3) 4 = ln(3x * x^3/3) 4 = ln(x^4) e^4 = x^4 x = e Last edited by Reincarnate; 09-17-2012 at 03:53 PM.. |
09-17-2012, 04:08 PM | #6 |
the Mathemagician~
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Re: ATTN: Math geniuses
I guess the second one is ln(x)^3.
4 - ln(x^3/3) = ln(x^3) 4 - ln(x^3) + ln(3) = ln(x^3) 4 + ln(3) = 2 ln(x^3) (4 + ln(3)) / 2 = ln(x^3) e^((4 + ln(3)) / 2) = x^3 x = e^((4 + ln(3)) / 6) x = e^(2/3 + ln(3)/6) x = e^(2/3) * e^(ln(3)/6) x= e^(2/3) * 3^(1/6) |
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