For some reason my calculator wont seem to work this out...help please

The "E"s are meant to represent scientific notation. You could replace them with a "5.887x10^5" type of thing, but I thought that would have made it more confusing.

Yes, I have tried the quadratic equation (the negative "b" plus or minus the square root of "b" squared minus BLAH BLAH BLAH). I know the equation by heart, and tried it in my calculator. Could someone please help with this.