Question 135465
x(x+2)=339
x^2+2x-339=0
the answer (using the quadratic equation {{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} is:
17.439 & 19.439.
the sum is (the b value in the equation ax^2+bx-c, where a=1) 
19.439-17.439=2 answer.