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Section 1: General Operations 25
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×
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Reverses division operation: you are back where you started.
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gLSTX
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Retrieves last number displayed before multiplication operation.
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÷
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Correct operation produces desired results.
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If you want to correct a number in a long calculation, Last X can save you from starting over. For example,
divide 12 by 2.157 after you have divided by 3.157 by mistake.
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12 ENTER 3.147 ÷
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You wanted to divide by 2.157, not 3,157.
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gLSTX
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Retrieves last number displayed preceding operation.
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×
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You’re back at the beginning.
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2.157 ×
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Correct operation produces desired results.
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Another, and possibly more important, use for Last X is in functions where x appears more than once.
Without going into details since we have not yet discussed functions, examples might be:
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sin x
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, yx — √x, sin x + cos3 x
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x
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In each case x is saved in Last X after the first operation is performed.
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The following operations (including inverses) save x in Last X:
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+, –, ×, ÷, D.MS, D.MS+, INT, LN, LOG, OCT,
R P, SIN, COS, TAN, n!, , 1/x, yX, ABS.
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Note that CLx does not affect the Last X register.
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