iheartfood
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iheartfood
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|dw:1353461289646:dw|
iheartfood
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this is the question, in case my handwriting/drawing is hard to see :P
iheartfood
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answer choices A,B,C,D from top to bottom :)
matricked
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5x
iheartfood
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how'd u get that? :O
iheartfood
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im not quite sure if i am understanding this right, but did u just make the 5x not an exponent, so that takes out the ln, so you get e=5x ?? idk is that right?
jim_thompson5910
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ln is a natural log which 'undoes' the exponential function with 'e' as a base
so basically
ln(e^x) = x
and
e^[ ln(x) ] = x
which tells you that f(x) = ln(x) and g(x) = e^x are inverse functions
iheartfood
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okay, wait so my answer is ln(x) ? or is it ln(5x) ?
jim_thompson5910
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no i'm just saying in general
iheartfood
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wait scratch that... there is no ln(5x) haha my bad... or is it just 5x ?
iheartfood
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ohhh okay :P i see
jim_thompson5910
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in my example, replace each 'x' with '5x'
iheartfood
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okay :) so my answer is B. 5x because of that? since e=x ? and x = 5x ?
iheartfood
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is that right? since u said e=x right?
jim_thompson5910
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you are correct, and no i didn't say e = x
jim_thompson5910
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not sure where you got that
iheartfood
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oops sorry! i meant this: e^[ ln(x) ] = x lol :P
and okay great!! thanks!! :)
jim_thompson5910
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i gotcha
iheartfood
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oops sorry! i meant this: e^[ ln(x) ] = x lol :P
and okay great!! thanks!! :)