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    How do I find t from this
    0.746=1-e^(-0.183t)
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    (Original post by dont)
    How do I find t from this
    0.746=1-e^(-0.183t)
    It's best to isolate e^(-0.183t) first, do you have any ideas what you could do next?
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    (Original post by KaylaB)
    It's best to isolate e^(-0.183t) first, do you have any ideas what you could do next?
    Take 1 away to get -0.254 on the left?
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    (Original post by dont)
    Take 1 away to get -0.254 on the left?
    That is correct. Now you're going to want to get rid of the minus and apply a special function to both sides to get rid of the e. And then it becomes easy to deduce what t is
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    What subject is this for?
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    (Original post by Ano9901whichone)
    What subject is this for?
    Maths
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    How do you know it's not for physics?

    (Original post by KaylaB)
    Maths
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    (Original post by Sinfire)
    That is correct. Now you're going to want to get rid of the minus and apply a special function to both sides to get rid of the e. And then it becomes easy to deduce what t is
    so times both sides by -1. Im not sure what to do then. Do I take ln of both sides as I think that's the inverse to e.
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    Yes because ln(e) will end up giving u 1


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    (Original post by dont)
    so times both sides by -1. Im not sure what to do then. Do I take ln of both sides as I think that's the inverse to e.
    Yes, ln is the reverse of e.

    Once you've done that it will be fairly straightforward to work out t.
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    Thanks everyone
 
 
 
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