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Would someone be able to solve this equation for me: 3e^-10x = 6
i just want to see if my solution is right... thanks.
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Exponent Question ?
base e
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#3
21 September 2011 - 11:01 AM
Hal. 
Molecule
The route to a solution can have many paths . Some take one step where others take three . Some explain one step where others explain three . When you put a calculated value for x into the equation do you get an answer of 6 ?
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#4
21 September 2011 - 11:56 AM
imatfaal
Primate
first thing to do would be simplify it and make it clear to the board where the exponent ends. the next step is fairly easy - but fswd is correct; show us what you got already
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there shallow draughts intoxicate the brain, and drinking largely sobers us again.
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there shallow draughts intoxicate the brain, and drinking largely sobers us again.
- Alexander Pope
feel free to click the green [+] ---->
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#5
21 September 2011 - 12:13 PM
Hal.
Molecule
It is possible to make a mistake and another mistake which then corrects it and you don't know of either . When you manipulate the original equation you will get different equations . Put the final value of x that you calculated at the very end into each of these equations to see if the left hand side equals the right hand side all the way from start to finish .
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#6
21 September 2011 - 12:23 PM
1123581321
Quark
ok, i got: x = ln(2/10)...
ok, i got: x = ln(2/10)...
but my answer doesn't give me 6 when subbed back into the equation.
ok, i got: x = ln(2/10)...
but my answer doesn't give me 6 when subbed back into the equation.
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#7
21 September 2011 - 12:34 PM
Hal.
Molecule
x is not equal to ln(2/10)
I think you have dropped a negative sign somewhere along the way .
You may also be getting the natural log of 10 % of what you should be getting the natural log of .
I think you have dropped a negative sign somewhere along the way .
You may also be getting the natural log of 10 % of what you should be getting the natural log of .
This post has been edited by Hal.: 21 September 2011 - 12:46 PM
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#8
21 September 2011 - 12:38 PM
ewmon
Baryon
1123581321, on 21 September 2011 - 12:23 PM, said:
ok, i got: x = ln(2/10)...
but my answer doesn't give me 6 when subbed back into the equation.
but my answer doesn't give me 6 when subbed back into the equation.
Then your answer is wrong.
Quote
i got: x = ln(2/10)...
Show your entire equation. There's no use in speculating about an equation with "..." in it.
This post has been edited by ewmon: 21 September 2011 - 12:39 PM
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#10
22 September 2011 - 10:02 AM
imatfaal
Primate
1123581321 - you are not really gonna learn unless you put down your method. the comments from forum members are all correct as far as I can see, but they cannot really help till you are more explicit. maths just doesn't work in leaps - it works in small repeatable and easily understood steps; I would do your equation in 5 steps, even though I know what the answer would be in 1 step.
A little learning is a dangerous thing; drink deep, or taste not the Pierian spring:
there shallow draughts intoxicate the brain, and drinking largely sobers us again.
- Alexander Pope
feel free to click the green [+] ---->
there shallow draughts intoxicate the brain, and drinking largely sobers us again.
- Alexander Pope
feel free to click the green [+] ---->
- Posts: 1,751 | Joined: 28-September 10
- Reply
have a real solution of 
,
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