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07-05-2007, 15:46
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#1 (permalink) |
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Logarithm Question
Im stuck on an equation. Anyone good at Logs?
[Q] Solve: Log2X + Log4X = 2 I got to the next bit with the change of base rule: (Log10X / Log102) + (Log10X / Log104) = 2 Now Im stuck.  
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07-05-2007, 15:48
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you can write the sum of two logs as the multiplication of the 2x and the 4x.
taking the antilog of both sides (2x)*(4x) = antilog of 2 8x^2 = 100 x = 3.5355
e: vdk[at]theasianplace[dot]net
  Join the Facebook Page1 Page2 Page3 Page 4 Page 5 Page 6 "I'm not heterosexual, homosexual, or bisexual. I'm just sexual. NO. MOTHERFUCKING. PREFIX.\" I'm just sitting here daydreaming about you and all the things you do Girl feels so right And all I know is you're the one for me, that special kinda' lady In my life, in my life yeah |
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07-05-2007, 15:59
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no worries!
e: vdk[at]theasianplace[dot]net
Join the Facebook Page1 Page2 Page3 Page 4 Page 5 Page 6 "I'm not heterosexual, homosexual, or bisexual. I'm just sexual. NO. MOTHERFUCKING. PREFIX.\" I'm just sitting here daydreaming about you and all the things you do Girl feels so right And all I know is you're the one for me, that special kinda' lady In my life, in my life yeah |
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09-05-2007, 23:49
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Right, Voodoo or anyone else good at le mathmetique, I am in another Log predicament.
 Question: "Solve the simulatanoues equations leaving your answer as an exact fraction": [E1] 8Y = 42X+3 [E2] Log2Y = log2X + 4 What voodoo stated before, taking the anitlogs: I dont know if this is the right direction to take but, I took the anti logs of [E2]. That left me with: Y = X + 4 Then I subsituted this "X + 4" as "Y" into [E1] so I got: 8X+4 = 42X+3 Therefore this gives: (84)(X4) = 42X+3 And Now Im Stuck.  Help 
Last edited by Zero; 09-05-2007 at 23:49. |
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09-05-2007, 23:56
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In [E1] the "Y" is the power raised to 8. and in [E2] "2X + 3" is the power raised to 4. So it makes life difficult. 
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09-05-2007, 23:57
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u can get an online calculator to do the powers of such equations if u dont have to show the work use that. but i am still confused as to how the original equation looks like
can u put up a pic i can help u prolly.
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10-05-2007, 00:18
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LOL I'm keeping out of this one.
I'm glad I didn't take maths any further!
I mean nobody likes me, everybody hates me, keep that shit coming, watch how much stronger it makes me!
Its not like I idolize this Machiavelli I idolize that type of thinking where you do what evers gonna make you achieve ur goals |
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10-05-2007, 00:24
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We touched on this in college it was a nightmare to do!
I mean nobody likes me, everybody hates me, keep that shit coming, watch how much stronger it makes me!
Its not like I idolize this Machiavelli I idolize that type of thinking where you do what evers gonna make you achieve ur goals |
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