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Math Help - still working on poly

  1. #1
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    still working on poly

    (3x2-5x +7) +(x2 +2x -1)
    =(3x2 +x2) (-5x + 2x) (7 -1)
    =(4x2) (-3x) (7)
    Why does (7 -1) =7 and not 6
    and what word do I use to raise my 2 tosquare or to the power of
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  2. #2
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    Quote Originally Posted by Leona_Marie View Post
    (3x2-5x +7) +(x2 +2x -1)
    =(3x2 +x2) (-5x + 2x) (7 -1)
    =(4x2) (-3x) (7)
    Why does (7 -1) =7 and not 6
    and what word do I use to raise my 2 tosquare or to the power of
    that should be 4x^2 -3x +6 and not 7.
    you can use this symbol ^
    Last edited by princess_21; January 20th 2009 at 08:40 AM. Reason: typo error
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  3. #3
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    Quote Originally Posted by Leona_Marie View Post
    (3x2-5x +7) +(x2 +2x -1)
    =(3x2 +x2) (-5x + 2x) (7 -1)
    =(4x2) (-3x) (7)
    Why does (7 -1) =7 and not 6
    and what word do I use to raise my 2 tosquare or to the power of
    You have a sum of two sums. The brackets are not necessary here:

    (3x^2-5x+7)+(x^2+2x-1)=3x^2+x^2-5x+2x+7-1 = 4x^2-3x+6
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  4. #4
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    Quote Originally Posted by princess_21 View Post
    that should be 4x^2 -3x +6 and not 7.
    you can use this symbol ^
    I also thought it was 6 but I use this web sight to taech myself,and 7 was the answer I was given. I know how to use 4x^2, but I would rather use
    4x2 meaning 4x times 2 is different than 4x squared by 2. I just wanted to know which font I would use to make a small 2 above the x.
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  5. #5
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    Quote Originally Posted by princess_21 View Post
    that should be 4x^2 -3x +6 and not 7.
    you can use this symbol ^
    I understand what you were saying now, duh sometimes I go cwazy
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  6. #6
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    Quote Originally Posted by Leona_Marie View Post
    I also thought it was 6 but I use this web sight to taech myself,and 7 was the answer I was given. I know how to use 4x^2, but I would rather use
    4x2 meaning 4x times 2 is different than 4x squared by 2. I just wanted to know which font I would use to make a small 2 above the x.
    it is better to try factoring rather than relying on websites.
    you should try so you can practice.
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  7. #7
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    Quote Originally Posted by princess_21 View Post
    it is better to try factoring rather than relying on websites.
    you should try so you can practice.
    I'd like to do a little factoing. first I have to learn how.
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