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Math Help - simplifying algebra

  1. #1
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    simplifying algebra

    ok so im new to here any help will be gratefully excepted...

    a)5x + 2(2x-1) i) x + 6
    b)7x - 3(2x-2) ii) 9x-1
    c)4(3x-1) -6(x+1) iii)6x + 4
    d) (6x-3) + (3x + 2) iv)x + 5
    e)5x + 7) - (3 - x) v) 9x - 2
    f)2(5x + 1) -3(3x - 1) vi) 6x - 10

    so i need to know which goes with which
    Last edited by pesfloyd; November 5th 2007 at 10:09 AM.
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  2. #2
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    i need help soon guys
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  3. #3
    Senior Member slevvio's Avatar
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    Look at the first one:

    5x + 2(2x-1)

    Just multiply out the brackets to get:

    5x + 4x - 2. You can add the x terms together (5x + 4x = 9x) to give the result:

    v) 9x - 2.

    Just do the same thing for the other ones.
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  4. #4
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    Yeh i knew the first one its the other im struggling with for example number 2

    7x-3(2x - 2) would that mean that would be 7x - 6x - 6
    which would then be x-6 which isnt there?
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  5. #5
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by pesfloyd View Post
    Yeh i knew the first one its the other im struggling with for example number 2

    7x-3(2x - 2) would that mean that would be 7x - 6x - 6
    which would then be x-6 which isnt there?
    Check the sign on your last term:
    7x - 3(2x - 2) = 7x - 3 \cdot 2x - 3 \cdot -2 = 7x - 6x + 6

    -Dan
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  6. #6
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    Quote Originally Posted by pesfloyd View Post
    ok so im new to here any help will be gratefully excepted...

    a)5x + 2(2x-1) i) x + 6
    b)7x - 3(2x-2) ii) 9x-1
    c)4(3x-1) -6(x+1) iii)6x + 4
    d) (6x-3) + (3x + 2) iv)x + 5
    e)5x + 7) - (3 - x) v) 9x - 2
    f)2(5x + 1) -3(3x - 1) vi) 6x - 10

    so i need to know which goes with which
    A) v \because
    5x + 2(2x - 1) \therefore 9x - 2
    \therefore 5x + 4x - 2
    \therefore 9x - 2

    B) i \because
     7x - 3(2x-2)
    \therefore 7x - 6x + 6
    \therefore x + 6

    C) vi \because
    4(3x-1) -6(x+1)  \therefore
    \therefore 12x - 4 - 6x - 6
    6x -10

    D) ii \because
    (6x-3) + (3x + 2)
    \therefore 6x - 3 + 3x + 2
    \therefore 9x - 1

    E)iii \because
    (5x + 7) - (3 - x)
    \therefore 5x + 7 - 3 + x
    \therefore 6x + 4

    F)iv \because
    2(5x + 1) -3(3x - 1)
    \therefore 10x + 2 - 9x + 3
    \therefore x + 5
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