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Math Help - Rearrange

  1. #1
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    Question Rearrange

    Hi jus a little help. Good someone show me the steps for rearranging the following equation in terms of 'u' please:

    164 = u + 8 - 0.5 * 0.5 * (8^2)

    ?
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  2. #2
    Bar0n janvdl's Avatar
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    Quote Originally Posted by taurus View Post
    Hi jus a little help. Good someone show me the steps for rearranging the following equation in terms of 'u' please:

    164 = u + 8 - 0.5 * 0.5 * (8^2)

    ?
    Let's simplify a bit first...

    164 = u + 8 - (0,5 \times 0,5 \times 64)

    164 = u + 8 - 16

    164 - 8 + 16 = u

    164 + 8 = u

    u = 172


    EDIT: This is my 5th post
    Last edited by janvdl; September 25th 2007 at 10:34 PM.
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  3. #3
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    got another one

    i got another one im a bit confused on:
    (to get u)

    10 = 0.5 * 9.81 * ((40/u)^2)

    now wat i tried was:

    10 = 4.91 * ((40/u)^2) -------------------- (0.5 * 9.81)

    then i got a bit confused there, do i square root it all or wat?
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  4. #4
    Bar0n janvdl's Avatar
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    Quote Originally Posted by taurus View Post
    i got another one im a bit confused on:
    (to get u)

    10 = 0.5 * 9.81 * ((40/u)^2)

    now wat i tried was:

    10 = 4.91 * ((40/u)^2) -------------------- (0.5 * 9.81)

    then i got a bit confused there, do i square root it all or wat?
    10 = 0,5 \times 9,81 \times ( \frac{40}{u} )^2

    10 = 4,905 \times \frac{1600}{ u^2 }

    \frac{1600}{ u^2 } = 2,04

    \frac{1600}{2,04} = u^2

    784,8 = u^2

    u = 28,01
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