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factor the expression:

ok I no how to start of which would be
(10a- )(a+ )
but i don't no how to factor it from here

  • math -

    If you are in a class-room situation, then you should have been taught some kind of "method" to do these, just plain guessing works only up to a point.

    there are actually two choices for the first terms
    (10x..)(x...) or (5x....)(2x....)

    at the back it would have to be
    (..-7)(...-1) or (...+7)(...+1)

    remember, after you make your choice, expand to see if you get the original.

  • math -

    ok i get it now i just didn't no what to do with the middle number

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