HP 48G Series Quick Start Manual page 85

Lesson 28: Areas Under Curves
The AEEA command in the PICTURE FCN menu finds a definite
integral based on the current function. That is, it calculates and
displays the area between the current function and the x-axis between
two x-values you designate.
Example: Find the area under the current polynomial
(X° +X —-5X3 2X2 +X — 4) between z = —2.2 and
|
mbm
Step 2: Use Decimal Zoom to force each horizontal pixel to be
equivalent to 0.1 units. Then move the cursor to x = —2.2
(the lower limit), and mark it. Note the use of the
multiplication key (X) to "mark" a cursor position.
Step 1: Reopen PLOT and redraw the polynomial.
@OE
3 (0) (ENTER) 3 (ENTER) (5)
12°) (ENTER) 12 (ENTER)
ERASE DEAN
Se]
ETT] FERS
ZDECT TH.
(») or (4) as needed
(X) (to mark the cursor position)
Hh: -d.g@ ¥: -1.90476E-1
Step 3: Find the selected area. Note that for finding the numerical
integral, the shading is for display purposes only and is
entirely optional.
(») (7 times) i |
(to redisplay the menu)
FCH RARER
Te
AREA: 5.80050916666
Plotting Equations and Analyzing Graphs 6-17