
Lesson 26: Finding Roots Graphically
In Lesson 17, yon found all of the roots of a polynomial using the
SOLVE application. This lesson shows you how to use the special
analytic tools in the PICTURE environment to find the roots of a
function visually as well as search for other information about a
function.
Example: Plot the function, — 5A'^ — 2A'“ + A' — 4, and
find its real roots.
Step 1: Begin the PLOT application and reset, the plot display
options.
FÍES
® @ F (T) flCT
(B OK
PLDT®
TVPE:
INDEP: X H-VIEW:-6.5 6.5
_ftUTDSClHLE V-VIEH:-3. 1 3.2
ENTER FUNCTinH(s:i TD PLOT
______
Step 2: Enter the function.
ClJ ly C±D ©X O 4
® 0 -5 ©"^ (zD 3 ® 0 2
©X (ZD 2 © © ©X Q 4
(ENTER 1
plot;
TYPE: Function Rad
INDEP: X H-VIEW:-6.5 6.5
_flUTDiCRLE V-VIEW:-3.1 3.2
ENTER FUNCTIDH(S) TO PLOT
_______
■naiiiPrriliUi—iiiJHiNiTiHgiaailBi
Step S: Erase the "blackboard” (the PICTURE display) and draw
the function.
I
HiiiisiBBnl Bin
Plotting Equations and Analyzing Graphs 6-13
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