factor 36 and add them, make sure both are negatie
1+36=37, nope
2+18=20 nope
3+12=15,nope
4+9=13, nope
6+6=12, nope
the closest one is 20
I hope you meant adds to -20, because if you did, then answer is -2 and -18
if you did mean 36 and adds to -21, then the numbers are [tex] \frac{-21-3 \sqrt{33} }{2} [/tex] and [tex] \frac{-21+3 \sqrt{33} }{2} [/tex], aprox -19.1168 and -1.8831
