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maTH

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x(x - 1)(x + 1). Would you FOIL the parenthesis first or multiply the x by (x-1) first?

  • maTH -

    It doesn't matter. You will get the same answer. It will go a bit faster if you recognize that
    (x - 1)(x + 1)= x^2 -1
    and then multiply that by x.

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