math

8/x+4 = 12/5x - 13 (solve the proportion)

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asked by ashley
  1. The way you typed it ....

    multiply each term by 5x the LCD
    8 + 4x = 12x^2 - 13x
    12x^2 - 17x - 8 = 0
    use the quadratic formula to find 2 answers

    what you probably meant:

    8/(x+4) = 12/(5x-13)
    40x - 104 = 12x + 48
    28x = 152
    x = 152/28 = 38/7

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    posted by Reiny
  2. 152

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    posted by ashley

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