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cubbieben
cubbieben asked in Science & MathematicsMathematics · 9 years ago

What is the sum of the two rational expressions 4/x2-3x + 6/3x-9? Please show step by step?

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  • Anonymous
    9 years ago

    first you must find common denominator, to do that first factorize each denominator:

    4/x2-3x + 6/3x-9 = 4/x(x-3) + 6 /3(x-3)

    so common denominator is 3x(x-3),

    ... = (4*3+6x)/3x(x-3) = 12+6x / 3x(x-3) = 2x+4 / x(x-3)

  • ?
    Lv 7
    9 years ago

    The LCD is 3x(x - 3

    [(3*4) + 6x]/(3x(x - 3)) = (4 + 2x)/(x^2 - 3x)

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