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March 25, 2017

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Add or subtract as indicated.

5x/x+3+28/x-3-90/x^2-9

  • algebra - ,

    I think you mean

    5x/(x+3) + 28/(x-3) - 90/(x^2 - 9)

    the LCD is (x+3)(x-3) or (x^2-9)

    = ( 5x(x-3) + 28(x+3) - 90)/(x^2-9)
    = (5x^2 - 15x + 28x + 84 -90)/(x^2 - 9)
    = (5x^2 + 13x - 6)/(x^2 - 9)
    = (x+3)(5x-2) /( (x+3)(x-3) )
    = (5x-2)/(x-3)

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