HP 40gs HP 39gs_40gs_Mastering The Graphing Calculator_English_E_F2224-90010.p - Page 331
G, then D, then B. When, The three up arrows moved the highlight up to node A, high
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Pressing down arrow at that point moved down the tree. The default is to move to the left-most node D. This meant that the 2 was highlighted and so when you pressed 3 it was that expression which was cubed. At that point the tree now appears as shown right with the CAS in 'typing/editing mode' on node G. B * A + C 81 Pressing up arrow three times placed the highlight successively on nodes D G, then D, then B. When 2 was pressed it squared the entire ^ expression defined by node B which was '23X'. This necessitated E X brackets and so they were automatically added. The result was the tree shown to the right, with nodes P and Q F 2 G 3 A + added below node A. You may notice that it is heavily canted to the left and this tends to be fairly typical of the way we generally P C ^ 81 write expressions. Now press up arrow three times and then divide by 5. B * 2 Q D E ^ X The three up arrows moved the highlight up to node A, high lighting the entire expression. Dividing by 5 therefore applies to F G the entire expression, with the result shown below. 2 3 R A + 5 S P C ^ 81 The new tree is shown below with nodes R and S added above A. B * Although it is not strictly necessary for you to understand or use D this concept of a tree of operations you may find that it will ^ help you to follow why the highlight behaves as it does as it moves around. A final example may help with the visualization. F 2 E X G 3 2 Q 331