HP 40gs HP 39gs_40gs_Mastering The Graphing Calculator_English_E_F2224-90010.p - Page 330
Notice that in each case the power was applied to the currently
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viii. Pressing this time will result in the screen shown below right which displays the two complex roots. ix. Press , , CLEAR to clear the highlighted expression, which in this case is the whole CAS editing screen. In the material on the following page we will explore this editing screen in more detail, looking particularly at why it is necessary to highlight expressions in some cases and not others, and how to move the highlight from one component of the expression to another and how to use special keys to manipulate the expression. In the HOME view press and then follow the sequence of keys below: Press 2 + 3 4 In this case you will notice that the power of 4 was placed so that it applied only to the last character typed; the 3. Press up arrow twice. Then press ENTER. Notice that pressing up arrow caused more and more of the expression to be highlighted. Pressing ENTER evaluated the currently highlighted expression of 3^4 to be 81. Press left arrow once then down arrow once. Press up arrow three times & finally press 2. (DO NOT use the X2 button for this.) 3, then press Notice that in each case the power was applied to the currently highlighted element of the expression. Brackets are automatically added as required. Notice also the movement of the highlight. If you regard the original expression of 2X+81 as a tree of operations as shown right then it may make more sense. When you finished step 2 the highlight was on C, the node containing 81. Pressing left arrow moved horizontally from node C to node B. The highlight at that point encompasses everything at or below node B. In this case this is the expression '2*X'. D 2 B * 330 A + E X C 81