Page 858 - Algebra 1

APPENDIX
L E5S S O N Evaluating Expressions with Technology
New Concepts
A graphing calculator can help you evaluate expressions for several values of the variable.
Using a Graphing Calculator to Evaluate Expressions
a. Use a graphing calculator to evaluate 3x2 + 2x - 1 for x = 50, 150, 250, 350 and 450.
SOLUTION
Press .
Enter3x2 +2x-1forY1.
Press to set the table values.
Enter the first value of x, 50, for TblStart.
For ΔTbl, enter the difference in the x-values, 100.
Press .
In the first column, you will see the values of x.
The second column shows the value of the expression for each value of x.
b. Use the table to find the value of the expression when x = 550. SOLUTION
Find 550 in the first column, and look across from it. The value is 908,599.
c. Use the table to find the value of x if the expression is equal to 368,199.
SOLUTION
Find 368,199 in the second column. It is next to x = 350.
Example
1
Appendix Lesson 5 843
APPENDIX LESSONS