Texas Instruments TI-84 PLUS Guidebook - Page 306
Box with Lid, Defining a Function
UPC - 033317192120
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3. Press 2 ¿ ƒ A ƒ [:] Ì 6 ¿ ƒ B ƒ [:] 5 ¿ ƒ C Í. The coefficient of the x2 term, the coefficient of the X term, and the constant for the new equation are stored to A, B, and C, respectively. 4. Enter the quadratic formula using Classic entry: £ Ì ƒ B à y C ƒ B ¡¹4 ƒ A ƒ C ~¤¥£2 ƒ A ¤. Because the solution is a complex number, you have to enter the formula using the division operation instead of using the n/d shortcut template. Complex numbers are not valid in the n/d template in input or output and will cause Error: Data Type to display. 5. Press Í to find one solution for the equation 2x2 N 6x + 5 = 0. 6. Press } to highlight the quadraticformula expression, and then press Í to paste it to the entry line. 7. Press | until the cursor is on the + sign in the formula. Press ¹ to edit the quadratic-formula expression to become . 8. Press Í to find the other solution for the quadratic equation: 2x2 N 6x + 5 = 0. Box with Lid Defining a Function Take a 20 cm × 25 cm. sheet of paper and cut X × X squares from two corners. Cut X × 12½ cm rectangles from the other two corners as shown in the diagram below. Fold the paper into a box with a lid. What value of X would give your box the maximum volume V? Use the table and graphs to determine the solution. Chapter 17: Activities 299