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Math Help - [SOLVED] i need help with

  1. #1
    lilfreak
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    Red face [SOLVED] i need help with

    Please help me solve these two problems. i tried and tried to solve theme:confused

    1.2/5( 5a +35) - 8 =12

    2.2x + 3/4(4x +16)= -8

    I am sorry it was one more

    3.-4/7a = - 28
    Thank You
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  2. #2
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by lilfreak View Post
    2/5( 5a +35) - 8 =12
    (2/5)(5a) + (2/5)(35) - 8 = 12

    2a + 2*7 - 8 = 12

    2a + 14 - 8 = 12

    2a + 6 = 12

    2a + 6 + (-6) = 12 + (-6)

    2a = 6

    2a/2 = 6/2

    a = 3

    -Dan
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  3. #3
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by lilfreak View Post
    2x + 3/4(4x +16)= -8
    2x + (3/4)(4x) + (3/4)(16) = -8

    2x + 3x + 3*4 = -8

    5x + 12 = -8

    5x + 12 + (-12) = -8 + (-12)

    5x = -20

    5x/5 = -20/5

    x = -4

    -Dan
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  4. #4
    MHF Contributor Quick's Avatar
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    Quote Originally Posted by topsquark View Post
    (2/5)(5a) + (2/5)(35) - 8 = 12

    -Dan
    are you sure it's not meant to be 2/(5(5a+35))

    Although maybe that's just too farfetched...
    I NEED LATEX!!!!!!!
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  5. #5
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by lilfreak View Post
    -4/7a = - 28
    Can I assume this is (-4/7)a = -28?

    Then
    7(-4/7)a = 7*(-28)

    (-4)a = 7*(-28)

    (-4)a/(-4) = 7*(-28)/(-4)

    a = 7*(7) = 49

    -Dan

    Or:
    (-4/7)a = -28

    (-7/4)(-4/7)a = (-7/4)(-28)

    a = -7*(-7) = 49
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  6. #6
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by Quick View Post
    are you sure it's not meant to be 2/(5(5a+35))

    Although maybe that's just too farfetched...
    I NEED LATEX!!!!!!!
    I have a "KISS" for you, Quick. As my Daddy taught me:
    Keep
    It
    Simple
    Stupid.

    It could be that complicated, but odds are it's simple. If not, they'll let me know, I'm sure.

    -Dan
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