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    confusedkarl's Avatar
    confusedkarl Posts: 10, Reputation: 1
    New Member
     
    #1

    Jun 16, 2008, 12:02 PM
    can someone check my transpositions
    (R+ωL)(R-ωL)
    = R^2-ωL

    Z^2-R^2
    = (Z+R)(Z-R)


    h= -4.9t^2+55t+12
    make ‘t’ subject

    h= -4.9t^2+55t+12
    h-12=-4.9t^2+55t+12
    -12h=50.1t

    -12h/50.1=t


    Thank you
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
    Ultra Member
     
    #2

    Jun 16, 2008, 04:48 PM
    For the last one, you can't subtract a t term from a t^2 term:confused: .

    You just broke the laws of algebra. :) :rolleyes: :p

    You can easily check your answer by subbing it back in to the equation. If it works, you should get h. But you won't.:eek:



    Try completing the square. Can you do that?

    Upon doing that you get

    Multiply the right side by 5 to get the denominators the same, then we get:











    There, see what happened?

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