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Thread: maths help plz

  1. #1
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    Default maths help plz

    ok got a exam monday and cant do a few questions on revision sheet, plz explain how to do them:

    1) find X when:
    2x√8=2^x


    2) evaluate
    a) 3^-2

    b)27^2/3

    16^3/2

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    3^-2 equals 1 / 3^2
    27^2/3 equals 3√(27^2)
    16^3/2 equals 2√(27^3)
    Working on: Tithe Farmer

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    Quote Originally Posted by masterBB View Post
    3^-2 equals 1 / 3^2
    27^2/3 equals 3√(27^2)
    16^3/2 equals 2√(27^3)
    fancy explaining them? thanks

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    Quote Originally Posted by cookies1 View Post
    fancy explaining them? thanks
    x ^ -y is the same as 1 / ( x ^ y)
    x ^ z / y is the same y√(x^z)
    Working on: Tithe Farmer

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    Quote Originally Posted by masterBB View Post
    x ^ -y is the same as 1 / ( x ^ y)
    x ^ z / y is the same y√(x^z)
    tyvm +rep

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    anyone know the answer to question one?

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    Is that as in 2 multiplied by x, multiplied by √8, or 2 multiplied by the xth root of 8?
    <3

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    If its 2√8= 2^x then you do
    Log2√8=xlog2
    Log2√8/2=x
    x=5/2

    If its 2x√8=2^x then i have no idea lol.

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    If its 2x * √8 = 2 ^ x then you have to know Lambert's W func. Not sure if it's properly written then, because that shit's is REAL business Of course you can always try to take those 2 functions on a graph and mark the places where they cross each other :

    f(x) = 2 ^ x
    g(x) = 4√2 * x

    That's the only available solution I guess, judging by your age But it's still gonna be hard to get "exact" results. Peace!
    "Egoist: person, who cares more about himself rather then me." J.Tuwim

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