HP 40gs hp 40gs_user's guide_English_E_HDPMSG40E07A.pdf - Page 260
To enter X
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hp40g+.book Page 8 Friday, December 9, 2005 1:03 AM (- X) apply to it. As a result, the entered expression is interpreted, and displayed, as (2 + X)(3 - X). Select the entire expression by pressing and evaluate it by pressing . The result is: -(X2-X-6) Example2 To enter X2-3X+1, press: 2 -3 +1 If, instead, you had to enter -x2-3X+1, you would need to press: (-) 2 - 3 +1 Note that you press twice to ensure that the exponent applies to -X and not just to X. Example 3 Suppose you want to enter: 1-- + 1-- + 1-- + 1-2345 Each fraction can be viewed as a separate branch on the equation tree. In the Equation Writer type the first branch: 1 ÷ 2 and then select this branch by pressing . Now type + and enter the second branch: 1 ÷ 3 Select the second branch by pressing . Now type + and enter the third branch: 1 ÷ 4 Likewise, select the third branch by pressing and then the fourth branch: 1 ÷ 5 , type + 15-8 Equation Writer