Casio fx 991MS User Guide - Page 25

• Any time until you input a value for the final coefficient (c for a quadratic equation, d for a cubic equation), you can use the [ and ] keys to move between coefficients on the screen and make changes, if you want. • Note that you cannot input complex numbers for coefficients. Calculation starts and one of the solutions appears as soon as you input a value for the final coefficient. Variable name x1= Arrow indicates direction you should scroll to view other 0. solutions. Solution Press the ] key to view other solutions. Use [ and ] to scroll between all of the solutions for the equation. Pressing the t key at this point returns to the coefficient input screen. • Certain coefficients can cause calculation to take more time. • Example 1: To solve the equation x3 - 2x2 - x + 2 = 0 (x = 2, -1, 1) (Degree?) 3 (a?) 1 = (b?) D 2 = (c?) D 1 = (d?) 2 = (x1 = 2) ] (x2 = -1) ] (x3 = 1) • If a result is a complex number, the real part of the first solution appears first. This is indicated by the "R↔I" symbol on the display. Press A r to toggle the display between the real part and imaginary part of a solution. 23