Casio FX-991ES Support Question
Casio FX-991ES Support Question
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Question posted by lunale on June 15th, 2014
How To Solve 2 Different Equations Simultaneously On Fx-991es
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Related Casio FX-991ES Manual Pages
User Guide - Page 3
... what function it . For details about input/output formats, see "Specifying the Input/Output Format".
• Keycap markings indicate what a key inputs or what the different colors of the second key.
User Guide - Page 4
... separate Appendix. Note that this manual are for illustrative purposes only, and may differ somewhat from the actual items they represent.
• The contents of this is...such as f, c, d, and e. k Using the Separate Appendix
Whenever you see "Using Calculator Memory". Initializing the Calculator
Perform the following shows an example of any kind whatsoever by the number key operation (1) ...
User Guide - Page 9
Select this type of operation: General calculations Complex number calculations Statistical and regression calculations Calculations involving specific number systems (binary, octal, decimal, hexadecimal) Equation solution Matrix calculations Generation of calculation that corresponds to the mode you want to perform this mode:
COMP CMPLX
STAT
BASE-N
EQN MATRIX
TABLE
VECTOR
(2) Press the ...
User Guide - Page 13
At this time, you can omit the multiplication sign (×) in any of a calculation, immediately before the = key is pressed. Example: sin 30 =
LINE
s30)=
Pressing s inputs "sin(".
• Note that the input procedure is different if you are inputting functions with parenthesis: 2 × sin(30), 2 × '(3), etc. • Before a prefix symbol (excluding...
User Guide - Page 28
... or result of the expression from independent memory. Sm(M)
• The "M" indicator appears in the upper left of the different operations you press the A key, change the calculation mode, or turn off the calculator.
Independent Memory Overview • The following is any value other than zero stored in independent memory.
• Independent memory...
User Guide - Page 31
... value to a2. *6 Value of a3 *8 Value of a5
Using SOLVE
(COMP)
SOLVE uses Newton's Method of syntax for Y.); Appendix
Calculate an +1 = an + 2n (a1 = 1) as XY + C = 0.)
• SOLVE cannot be used to solve an equation. XB = C + D, B (Solves for B.) The following types of approximation to solve an equation that contains an integral, derivative, Σ( function, Pol( function, Rec...
User Guide - Page 33
...equation
Solution variable
Math
Solution
(left side) - (right side) form result
• The "(left side) - (right side) form result" shows the result when the obtained solution is assigned to cancel the SOLVE operation. x + 1 for the following types of the obtained solution.
Continue Screen SOLVE... or A to the solution variable. Appendix Solve y = x2 - A periodic function (y...
User Guide - Page 38
... is used when you do. • ∫(, d/dx(, Pol(, Rec(, and Σ( cannot be used within f(x), a, or tol. • Differential calculations can be caused by approximating the derivative based on centered difference approximation. inclusion of the local maximum point and local minimum point in the COMP Mode only. • When performing a differential...
User Guide - Page 40
... a real number calculation, this function simply...calculations in the CMPLX Mode. Example: Pol ('2, '2) + 5 = 2 + 5 = 7
Appendix to
k Other Functions
This section explains how to use the functions shown below.
!, Abs(, Ran#, nPr, nCr, Rnd(
• These functions can be integers in the same modes as the trigonometric functions. In addition, the Abs( and Rnd( functions can be different...
User Guide - Page 42
...1,234 to engineering notation, shifting the decimal point to the left. Transforming Displayed Values
You can be used to transform a displayed decimal calculation result to one of the following equation are
equal:
Σ e
∞
=
n = 0
1 n! Formats Supported for S-D Transformation S-D transformation can use S-D transformation to engineering notation.
(Check rounded result.)
FIX
*14...
User Guide - Page 45
...;)
Example 1: 2 × ('3 + i) = 2'3 + 2i = 4 ∠ 30
(Angle Unit: Deg)
MATH
CMPLX
Math
2*(!3e+i)=
• With Linear format, the absolute value and argument are shown in
two different lines. Specifying the Calculation Result Display Format
You can override complex number display settings and specify the format that should be used to display...
User Guide - Page 52
...5(Var), 6(MinMax), or 7(Reg) on the STAT menu while linear regression is performed in accordance with the following model equation. y = A + BX
The following are the commands that appear on the sub-menus that appear when you want ... Maximum value of the Y-data
E-50
Commands when Linear Regression Calculation (A+BX) Is Selected With linear regression, regression is selected as the statistical...
User Guide - Page 53
...: to
• Examples through all use the data input in accordance with the following model equation. y = A + BX + CX 2
See Appendix for information about the calculation formula used for linear regression calculations. Appendix Quadratic Regression Calculation: to • Examples through all use the data input in Example .
*1 Estimated Value (y = -3 → m = ?) *2 Estimated...
User Guide - Page 54
...BASE-N)
The BASE-N Mode lets you perform arithmetic calculations, negative value calculations, and logical operations with binary, octal, decimal, and hexadecimal values.
Statistical Calculation Type
Logarithmic Regression (ln X)
e Exponential Regression (e^X)
ab Exponential Regression (A•B^X)
Model Equation
y = A + Bln X y = AeBX y = ABX
Power Regression (A•X^B) y = AXB
Inverse...
User Guide - Page 56
... setting and input a particular value using the decimal number base, for example.
k Negative Number Calculations and Logical Operations
To input a negative number calculation or logical operation command, press 13(BASE) to display page one of 3 using a different base. Appendix
Calculate 12 + 12 in octal. When inputting the value, press 13(BASE) c to display page...
User Guide - Page 57
..., be sure to re-enter the EQN Mode. E-55 Equation Calculations (EQN)
All calculations in this section are displayed with a minus sign. Key
Menu Item
1 anX + bnY = cn
2 anX + bnY + cnZ = dn
3 aX2 + bX + c = 0 4 aX3 + bX2 + cX + d = 0
Equation Type
Simultaneous Linear Equations with Two Unknowns
Simultaneous Linear Equations with negative binary values and examples of logical operations...
User Guide - Page 58
...The only difference is that the first STAT editor screen precaution does not apply in the COMP Mode with three unknowns or cubic equation is selected as the equation type, ... display the solution(s) for the STAT editor screen. Simultaneous linear equations with two unknowns
Cubic equation
Rules for each of an equation. E-56 Coefficient Editor Screen Input Precautions Coefficient editor screen...
User Guide - Page 59
... is displayed.
Matrix calculation results are performed in accordance with the input/ output format and complex number display format settings of the calculator's setup screen.
&#...quadratic or cubic equation, you can save matrices under the names "MatA", "MatB", and "MatC" in a special Matrix Answer Memory named "MatAns". • In the case of simultaneous linear equations, you can...
User Guide - Page 68
.... Dot product: • (Dot) 8. Addition and subtraction: +, - 10. Enclosing an operation within parentheses causes it to right when both types are mixed in different calculation results. Fractions: ab/c
4. 3. Prefix symbol: (-) (negative sign) d, h, b, o (base n symbol)
5. Multiplication and division: ×, ÷
Multiplication where sign is a prefix symbol (Priority...
User Guide - Page 72
...equation you are trying to use in the equation that you input. • Input a value for the matrices or vectors to perform your calculation. • Action
• Narrow the table calculation... with the calculation. Can't Solve Error (SOLVE feature only) • Cause
• The calculator could not obtain a solution. • Action
• Check for errors in a calculation was input ...
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