User manual CASIO FX-911SA

[. . . ] 2 Handling Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Removing the Hard Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Turning Power On and Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Adjusting Display Contrast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] The result is displayed as a fraction when Natural Display is selected. RanInt# : For input of the function of the form RanInt#(a, b), which generates a random integer within the range of a to b. See 15 . nPr, nCr : Permutation (nPr) and combination (nCr) functions. See 16 . Rnd : The argument of this function is made a decimal value and then rounded in accordance with the current number of display digits setting (Norm, Fix, or Sci). When Fix 3 is the display digits setting, for example, the result of 10 ÷ 3 is displayed as 3. 333, while the calculator maintains a value of 3. 33333333333333 (15 digits) internally for calculation. In the case of Rnd(10÷3) = 3. 333 (with Fix 3), both the displayed value and the calculator's internal value become 3. 333. Because of this a series of calculations will produce different results depending on whether Rnd is used (Rnd(10÷3) 3 = 9. 999) or not used (10 ÷ 3 3 = 10. 000). Note: Using functions can slow down a calculation, which may delay display of the result. Do not perform any subsequent operation while waiting for the calculation result to appear. To interrupt an ongoing calculation before its result appears, press . Integration and Differential Calculation Precautions · Integration and differential calculations can be performed in the COMP Mode ( ) only. · The following cannot be used in f(x), a, b, or tol: Pol, Rec, , d/dx, . · The following functions are not allowed inside of an equation: , d/dx, , Pol, Rec. To solve y = ax2 + b for x when y = 0, a = 1, and b = ­2 (Y) (X) (=) (A) (B) Math (SOLVE) Prompts for input of a value for Y Current value of Y E-20 Math 0 1 2 Current value of X Input an initial value for X (Here, input 1): 1 Solution screen To exit SOLVE: Note: During the time from when you press (SOLVE) until you exit SOLVE by pressing , you should use Linear Display input procedures for input. Important: · Depending on what you input for the initial value for X (solution variable), SOLVE may not be able to obtain solutions. If this happens, try changing the initial value so they are closer to the solution. · SOLVE may not be able to determine the correct solution, even when one exists. · SOLVE uses Newton's Law, so even if there are multiple solutions, only one of them will be returned. · Due to limitations in Newton's Law, solutions tend to be difficult to obtain for equations like the following: y = sin(x), y = ex, y = ' . x Solution Screen Contents Solutions are always displayed in decimal format. Equation (The equation you input. ) Math Variable solved for Solution (Left Side) ­ (Right Side) result "(Left Side) ­ (Right Side) result" shows the result when the right side of the equation is subtracted from the left side, after assigning the obtained value to the variable being solved for. The closer this result is to zero, the higher the accuracy of the solution. Continue Screen SOLVE performs convergence a preset number of times. If it cannot find a solution, it displays a confirmation screen that shows "Continue: [=]", asking if you want to continue. To solve y = x2 ­ x + 1 for x when y = 3, 7, and 13 (Y) (X) (X) (=) 1 (SOLVE) E-21 3 Input an initial value for X (Here, input 1): 1 7 13 Statistical Calculations (STAT) To start a statistical calculation, perform the key operation (STAT) to enter the STAT Mode and then use the screen that appears to select the type of calculation you want to perform. [. . . ] Action: Narrow the table calculation range by changing the Start, End, and Step values, and try again. Time Out Error Cause: The current differential or integration calculation ends without the ending condition being fulfilled. Note that this also decreases solution precision. Before Assuming Malfunction of the Calculator. . . Perform the following steps whenever an error occurs during a calculation or when calculation results are not what you expected. Note that you should make separate copies of important data before performing these steps. [. . . ]