1. Calculator Check for Equivalence of Simplified Expressions
Technology
6.1
Calculator Check for Equivalence
of Simplified Expressions
For Figure 6.1a,
Figure 6.1a
Enter the original expression, in Y1. ( ( 3  5 )
X,T,,n
MATH 3 ) x2
Enter the simplified expression, in Y2. ( 9  2 5 )
X,T,,n  6
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2. Calculator Check for Equivalence of Simplified Expressions
Technology
6.1
Calculator Check for Equivalence
of Simplified Expressions
Numeric Check
For Figure 6.1b,
Figure 6.1b
To check the equivalence numerically, view the table of values of Y1, the
original expression, and Y2, the simplified expression with whole-number
values for x.
2nd
TBLSET
ENTER 1
ENTER
ENTER ▼
ENTER
2nd
TABLE
Check the values for Y1, the original expression, and Y2, the simplified
expression. If the simplification was correct, corresponding values should
be equal.
(Note that we could have looked at a table of values for other x-values.)
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3. Calculator Check for Equivalence of Simplified Expressions
Technology
6.1
Graphic Check
For Figure 6.1c,
(-10, 10, -10, 10)
Figure 6.1c
To check the equivalence graphically, view the graphs of Y1, the
original expression, and Y2, the simplified expression.
ZOOM 6
The graphs should coincide. Check by using the trace feature of the
calculator or by setting the graph of Y2 to be drawn with a bubble.
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