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Math Help - Factoring

  1. #1
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    Factoring

    Ok it's 3a squared-2a-21
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  2. #2
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    Quote Originally Posted by Itachi888Uchiha View Post
    Ok it's 3a squared-2a-21
    3a^2 - 2a - 21 = 3a^2 + 7a - 9a - 21 = \, .....
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  3. #3
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    Quote Originally Posted by mr fantastic View Post
    3a^2 - 2a - 21 = 3a^2 + 7a - 9a - 21 = \, .....
    Um, no parenthesis?
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  4. #4
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    3a^2 - 2a - 21

    = 3a^2 - 9a + 7a - 21

    = 3a(a-3) +7(a-3)

    = (3a + 7)(a - 3)
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  5. #5
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    Quote Originally Posted by Itachi888Uchiha View Post
    Um, no parenthesis?
    The implication of  = \, ..... is that you continue working from where I left off.

    The intent is to give you a push in the right direction without spoon feeding the entire solution to you.
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  6. #6
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    Quote Originally Posted by mr fantastic View Post
    The implication of  = \, ..... is that you continue working from where I left off.

    The intent is to give you a push in the right direction without spoon feeding the entire solution to you.
    I didn't know what to do at all, and I didn't want to make up a problem because I wouldn't have been sure it worked. Now that, the other dude posted, I remember. It's been a long summer........
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  7. #7
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    well id teach you but my answers tend to be wrong

    but i think this guy explains it pretty good

    [YOUTUBE]http://www.youtube.com/watch?v=2Q8lG1WaqJY[/YOUTUBE]
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