HP 40G manual Define the expression, Keys to assist in the entry of equations

Define the expression

2.>1￿￿@Define the Fibonacci sequence, in which each term (after the first two) is the sum of the preceding two terms:

U = , U2 = 1 , Un = Un – 1 + Un – 2 for n > 3 .

In the Symbolic view of the Sequence aplet, highlight the U ( ) field and begin defining your sequence.

8￿>(>17(5@￿￿@￿1 >(17(5@ >￿@ 8￿_￿

Note: You can use the

,8￿_, and 8￿_menu

keys to assist in the entry of equations.

>(17(5@

Specify plot settings

3.In Plot Setup, first set the SEQPLOT option to Stairstep. Reset the default plot settings by clearing the Plot Setup view.

–A Stairsteps graph plots n on the horizontal axis and Un on the vertical axis.

–A Cobweb graph plots Un-1on the horizontal axis and Un on the vertical axis.

>6+,)7@SETUP-PLOT >6+,)7@CLEAR *e,￿*A,￿8￿>(17(5@ *A,￿8￿>(17(5@￿

6-2 Sequence aplet