Thread: consumers' and producers' surplus

Determine consumers’ surplus and producers’ surplus under market
equilibrium if the demand equation is

p = 400 − q2 and the supply equation

is p = 20q + 100.


I got (10,300) as equilibrium pt. Therefore, I ended up with -6883000 for consumer surplus and -927000 for producers surplus. I'm sure that i made a mistake somewhere to get these negative values... anyone can help?