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Math Help - Just deleted my working

  1. #1
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    Just deleted my working

    I accidentally just deleted some working and cannot get it back.

    Can you help me with this please.

    Factor fully: ( a - b - c ) - 4bc

    = (a-b-c) - (2bc)
    = (a - b - c - 2bc)(a - b - c + 2bc)
    = (a - (b + c))(a - (b c))
    =
    =
    = (a-b-c)(a+b+c)(a-b+c)(a+b-c)
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  2. #2
    MHF Contributor alexmahone's Avatar
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    Quote Originally Posted by Joel View Post
    I accidentally just deleted some working and cannot get it back.

    Can you help me with this please.

    Factor fully: ( a - b - c ) - 4bc

    = (a-b-c) - (2bc)
    = (a - b - c - 2bc)(a - b - c + 2bc)
    = (a - (b + c))(a - (b c))
    = (a-(b+c))(a+(b+c))(a-(b-c))(a+(b-c))
    = (a-b-c)(a+b+c)(a-b+c)(a+b-c)
    Missing working has been colored in red.
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  3. #3
    MHF Contributor Amer's Avatar
    Joined
    May 2009
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    Jordan
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    Quote Originally Posted by Joel View Post
    I accidentally just deleted some working and cannot get it back.

    Can you help me with this please.

    Factor fully: ( a - b - c ) - 4bc

    = (a-b-c) - (2bc)
    = (a - b - c - 2bc)(a - b - c + 2bc)
    = (a - (b + c))(a - (b – c))
    =
    =
    = (a-b-c)(a+b+c)(a-b+c)(a+b-c)
    (a^2 - (b+c)^2)(a^2-(b-c)^2)

    \left[(a-(b+c))(a+(b+c))\right]\left[(a-(b-c))(a+(b-c))\right]

    (a-b-c)(a+b+c)(a-b+c)(a+b-c)

    someone is faster than me .......
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  4. #4
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    Thanks Guys
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