Casio FX-CG10 Software User Guide - Page 130
High-order Equations from 2nd to 6th Degree
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2. High-order Equations from 2nd to 6th Degree Your calculator can be used to solve high-order equations from 2nd to 6th degree. • Quadratic Equation: ax2 + bx + c = 0 (a 0) • Cubic Equation: ax3 + bx2 + cx + d = 0 (a 0) • Quartic Equation: ax4 + bx3 + cx2 + dx + e = 0 (a 0) ... 1. From the Main Menu, enter the Equation mode. 2. Select the POLY (Polynomial) mode, and specify the degree of the equation. You can specify a degree 2 to 6. 3. Sequentially input the coefficients. • The cell that is currently selected for input is highlighted. Each time you input a coefficient, the highlighting shifts in the sequence: a → b → c → ... • You can also input fractions and values assigned to variables as coefficients. • You can cancel the value you are inputting for the current coefficient by pressing J at any time before you press w to store the coefficient value. This returns to the coefficient to what it was before you input anything. You can then input another value if you want. • To change the value of a coefficient that you already stored by pressing w, move the cursor to the coefficient you want to edit. Next, input the value you want to change to. • Pressing 3(CLEAR) clears all coefficients to zero. 4. Solve the equations. Example To solve the cubic equation (Angle unit = Rad) x3 - 2x2 - x + 2 = 0 1 m Equation 2 2(POLY) 2(3) 3 bw-cw-bwcw 4 1(SOLVE) Multiple Solutions (Example: x3 + 3x2 + 3x + 1 = 0) 4-3