Question 251930
x+y=-11
xy=15
.
y=-11-x
x(-x-11)=15
-x^2-11x-15=0
x^2+11x+15=0
x=(-sqrt(61)-11)/2, x=(sqrt(61)-11)/2
.
Ed
.
 *[invoke quadratic "x", -1, -11, -15]