Guest: 2000=(-8.255*10^-5)z^2+1.05z+1110
[input]2000=(-8.255*10^-5)z^2+1.05z+1110[/input]
yuck!
It is just a horrible quadratic equation so you can take the 2000 to the other side and use the quadratic formula
0=(-8.255*10^-5)z
2+1.05z+1110-2000
0=(-8.255*10^-5)z
2+1.05z-890
[input]0=(-8.255*10^-5)z^2+1.05z-890[/input]
+118616 
