Casio fx-991ES Calculator User Manual


 
E-30
•An error (Variable ERROR) occurs when the solution variable is
not included in the expression being solved.
k Example SOLVE Operation
Example: To solve y = ax
2
+ b for x when y = 0, a = 1, and b = –2.
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Sf(Y)Ss(=)Sy(A)
S)(X)w+Se(B)
1)(,)S)(X)
1s(SOLVE)
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Prompts for input of a value for Y.
Current value of Y
0=
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1=
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y2=
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Current value of X
=
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Solution Screen
•To interrupt an ongoing SOLVE operation, press A.
Precautions when Using SOLVE
• SOLVE may not be able to obtain a solution because of the initial
value (assumed value) of the solution variable. If this happens, try
changing the initial value of the solution variable.
SOLVE may not be able to determine the correct solution, even
when one exists.
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