Question 407624
1/x + 1/(x+1) = 15/56

multiply both sides by (x)*(x+1) and get
1/x*(x*(x+1)) + (1/(x+1))*(x*(x+1)) = (15/56)*(x*(x+1))
_________________________________
(x+1) + x = (15/56)*(x^2 + x)
_________________________________

2*x + 1 = (15/56)*x^2 +(15/56)*x
_________________________________

-0.2678*x^2 -0.2678*x +2*x +1 = 0
-0.2678*x^2 + 1.7321*x + 1 = 0



*[invoke quadratic "x", -0.2678, 1.7321, 1 ]