Texas Instruments TI-84 PLUS SILV Guidebook - Page 304

Entering a Calculation Begin with the equation 2x2 N 11x + 14 = 0. 1. Press 2 ¿ ƒ A to store the coefficient of the x2 term. 2. Press ƒ [:]. The colon allows you to enter more than one instruction on a line. 3. Press Ì 11 ¿ ƒ B to store the coefficient of the X term. Press ƒ [:] to enter a new instruction on the same line. Press 14 ¿ ƒ C to store the constant. 4. Press Í to store the values to the variables A, B, and C. The last value you stored is shown on the right side of the display. The cursor moves to the next line, ready for your next entry. 5. Press ƒ ^ 1 Ì ƒ B Ã y C ƒ B ¡¹ 4 ƒ A ƒ C ~~2 ƒ A to enter the expression for one of the solutions for the quadratic formula, ------b b----2---------4---a----c2a 6. Press Í to find one solution for the equation 2x2 N 11x + 14 = 0. The answer is shown on the right side of the display. The cursor moves to the next line, ready for you to enter the next expression. Converting to a Decimal You can show the solution as a decimal. 1. Press ƒ ^ 4 to select 4F3 4D from the FRAC shortcut menu. Chapter 17: Activities 297