Question 250367
both numbers are negative because their product is positive but their sum is negative
n*m=9000
n+m=-200
n=-200-m
substitute -200-m for n in the first 
(-200-m)*m=9000
-200m-m^2=9000
add -200m-m^2 to both sides
m^2+200m +9000=0
*[invoke quadratic "x", 1, 200, 9000 ]