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Thanks much guys/gals, got it working fine now.

Okay thanks a bunch, that's pretty much cleared it up.. though there's one value which isn't quite right. All are spot on except for the ones for

-3, 27, 0.5

I have the values as x1 = 9.01848...

Sorry if this seems a bit basic, I'm pretty new to all this etc. I'm trying to write a programme which can read in real coefficients of a 2nd order polynomial (ax^2 + bx + c = 0) and produce its...