Operations:  Evaluation of functions

Evaluating a given function for a given value can be done several ways.   Here are some good options

                Problem:   if x = 3 find the value of x2 + 2x -1

  1. The most obvious solution:  enter 32 + 2*3 -1 into the calculator. If you need to do another substitution, use the 2nd-Entry keys and edit the numbers. (see ENTRY topic)
  2. For multiple substitutions, place the expression in y= menu (only one variable can be used here) and use TABLES to get answers.
  3. Again, for expressions with only one variable, use the LIST functions.
    bulletPress 2nd-(  and enter the numbers to plug in, separated by a comma.  For example: {1,2,3,4,5}
    bulletClose the grouping with 2nd-)wpe1.jpg (3867 bytes)
    bulletPress STO key
    bulletPress 2nd-L1   or any other L# key.  and ENTER
    bulletType in the expression with L1 in place of the variable.
    bulletThe results are all the answers in order.

                                           wpe2.jpg (5327 bytes)

    4.   Finally, if the expression has more than one variable, try the following:wpe3.jpg (3731 bytes)

           Remember, you can enter ANY letter with ALPHA- key and the correct key with the letter above it.

    bulletIf x = 3,  press 3 STO x   ENTER
    bulletIf y = -2 press -2 STO -ALPHA-1 (that's y) enter
    bulletcontinue if there are more variables.
    bullettype in the expression, for example,    5x - 2y     ENTER
    bulletThe result is the answer.