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Math Help - factorise

  1. #1
    Member helloying's Avatar
    Joined
    Jul 2008
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    177

    factorise

    3(4x -y )-5(4x +4xy+y )

    I done the 1st step which is 3(2x+y)(2x-y)-5(2x+y)
    (2x+y)(3(2x-y))-5(2x+y)
    but then i cant facortise anymore after i take out the (2x+y)
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  2. #2
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    Smile

    3(2x+y)(2x-y)-5(2x+y)=(2x+y)[3(2x-y)-5(2x+y)]=(2x+y)[6x-3y-10x-5y]=
    =(2x+y)[-4x-8y]=-4(2x+y)(x+2y)
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