Texas Instruments TI-83 Plus User Manual page 52

Circles
If you receive this error
message...
Allowed parameter values: R
Allowed parameter values: A
Values out of range for
computation. Recheck window
settings
Parameters create a non-real
answer
TI-83 Plus Conic Graphing
Make this change:
0 Change the parameter so that R
0.
0 Change the parameter so that A
0.
Change the parameter so that
b < 1 12 (occurs only in polar
E
mode in equation 3).
Change the parameters so that for
the equation
2
AX +AY
following is satisfied:
(-D/A) + (B/2A)
2
+BX+CY+D=0, the
2
+ (C/2A)
2
0
Page 52