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To return to the Coefficient Editor while the solutions are displayed,
press .
To change the Inequality Type: Pressing (Polynomial) displays a
dialog box that you can use to select an inequality degree. Changing the
degree of an inequality causes the values of all Coefficient Editor
coefficients to become zero.
Inequality Mode Calculation Examples
3x
3
+ 3x
2
x > 0
 (Polynomial)(3
rd
degree inequality)(ax
3
+bx
2
+cx+d>0)
331

Note
Solutions are displayed as shown in the
screen shot nearby when something
other than MathI/MathO is selected for
the Input/Output setting on the setup
menu.
“All Real Numbers” appears on the solution screen when the solution of
an inequality is all numbers (such as x
2
0).
“No Solution” appears on the solution screen when no solution exists for
an inequality (such as x
2
< 0).
Ratio Calculations
The Ratio Mode lets you determine the value of X in the ratio expression A :
B = X : D (or A : B = C : X) when the values of A, B, C and D are known. The
following shows the general procedure for using Ratio.
1. Press , select the Ratio Mode icon, and then press .
2. On the menu that appears, select (A:B=X:D) or (A:B=C:X).
3. On the Coefficient Editor screen that appears, input up to 10 digits for
each of the required values (A, B, C, D).
To solve 3 : 8 = X : 12 for X, for example, press in step 1, and
then input the following for the coefficients (A = 3, B = 8, D = 12):
3812.
Pressing will reset all of the coefficients to one.
4. After all the values are the way you want, press .
This displays the solution (value of X). Pressing again will return
to the Coefficient Editor.
Important: A Math ERROR will occur if you perform a calculation while 0 is
input for a coefficient.
To calculate X in the ratio 1 : 2 = X : 10
(Select Type)(A:B=X:D)
1210
(X=)
5
Changing the Ratio Expression Type
Press (Select Type) and then select the ratio expression type you
want from the menu that appears.
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