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Math Help - Math help wanted :)

  1. #16
    Member garymarkhov's Avatar
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    Quote Originally Posted by el123 View Post
      100-5t-10^2+\frac{2t}{4}^2-5t-\frac{t^2}{4}
    You've expanded -2(5-\frac{t}{4})^2 incorrectly.

    You're going to need to get this algebra thing licked, mate

    x(a+b)^2=x(a+b)(a+b)

    =x(a^2+ab+ab+b^2)

    =x(a^2+2ab+b^2)

    =xa^2+2xab+xb^2

    Notice that the equation you're interested is in the form x(a-b)^2=x(a-b)(a-b), so you should get xa^2-2xab+xb^2 as a solution.
    Last edited by mr fantastic; September 12th 2009 at 12:29 AM.
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  2. #17
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    I hate algebra, confuses the heck out of me!

    This is driving me nuts , i still can't get it right.
    Thanks anyway.
    Last edited by mr fantastic; September 12th 2009 at 12:29 AM.
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  3. #18
    Member garymarkhov's Avatar
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    Quote Originally Posted by el123 View Post
    I hate algebra, confuses the heck out of me!

    This is driving me nuts , i still can't get it right.
    Thanks anyway.
    Algebra can be confusing, I agree. But with practice, it gets easier.

    If you're finding the algebra component of these questions hard, I suggest stopping whatever else you're doing and spending 2 hours watching some of the pre-algebra and algebra videos here: Khan Academy. Improving your algebra skills just a bit will pay off in a big way going forward.

    Cheers,

    Gary
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