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x/(x+1) + (x+1)/x = 2 1/12
take LCM
{x^2 + (x+1)^2 } / x(x+1) = 25/12
(x^2 + x^2 + 1 + 2x) / x(x+1) = 25/12
(2x^2 + 2x + 1) / (x^2 + x) = 25/12
by cross multiplication
24x^2 + 24x + 12 = 25x^2 + 25x
24x^2 - 25x^2 + 24x - 25x + 12 = 0
-x^2 - x + 12 = 0
multiply equation by (-1)
x^2 + x - 12 = 0
now, split the middle term
x^2 + (4x - 3x) - 12 = 0
x^2 + 4x - 3x - 12 = 0
x(x+4) -3(x+4) = 0
(x-3)(x+4) = 0
x = 3 or -4
PRACTICE IT BY YOURSELF ALSO!
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