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Math Help - Need Help!

  1. #1
    Newbie
    Joined
    Aug 2009
    Posts
    6

    Need Help!

    I don't completely understand this.

    multiply and simplify

    36y^2 * 3y-12
    3y^2-24y+48 6y

    here is what I understand

    (36y^2)(3y-12)
    (3y^2-24y+48)(6y)

    (36y^2)3(y-4)
    3(y^2-8y+16)(6y)

    what do I do next if I am correct?
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  2. #2
    Junior Member
    Joined
    Jul 2009
    Posts
    44
    Quote Originally Posted by Just4 View Post
    I don't completely understand this.

    multiply and simplify

    36y^2 * 3y-12
    3y^2-24y+48 6y

    here is what I understand

    (36y^2)(3y-12)
    (3y^2-24y+48)(6y)

    (36y^2)3(y-4)
    3(y^2-8y+16)(6y)

    what do I do next if I am correct?
    You are correct so far.

    Well, we can see we can cross-out the 3 on top and bottom to get

    \frac{(36y^2)(y-4)}{(y^2-8y+16)(6y)}

    Let's try to cross-out the 6y on the bottom:

    \frac{(6y)(6y)(y-4)}{(y^2-8y+16)(6y)}

    \frac{(6y)(y-4)}{(y^2-8y+16)}

    We can factor y^2-8y+16 to get (y-4)^2

    \frac{(6y)(y-4)}{(y-4)^2}

    We can cross out the (y-4) on the bottom and top

    \frac{6y}{y-4}

    And that's as far as we can go.
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  3. #3
    Newbie
    Joined
    Aug 2009
    Posts
    6
    Thank you, you explained that very well I have a full understanding now
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