Hp 39g Graphing Calculator Manuel d'utilisateur Page 92

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Plotting to find guesses
The main reason for plotting in the Solve aplet is to help you
find initial guesses and solutions for those equations that have
difficult-to-find or multiple solutions.
Consider the equation of motion for an accelerating body:
-V = Vnf +
at
2
where ,v is distance, vq is initial velocity, t is time, and a is
acceleration. This is actually tn’o equations, y = x and
y = Vq t + (aP) / 2.
Since this equation is quadratic for t, there can be both a
positive and a negative solution. However, we are concerned
only with positive solutions, since only positive di.stance
makes sense.
1. Select the Solve aplet and enter the equation.
I APLET I Select Solve HEU
I alphaIXB
2.
fALPHAlV [xllALPHAlT
[+11 alpha] A
[x](alpha]T[x5]02
:dlve svmmlic viehs
■PEliX=V*T+fl*TgA2
E3:
E4:
E5:
jgtniBimi
WilililljtW
Find the solution for T (time) when A=30, V=2, and
A=4. Enter the values for X, V, and A; then highlight the
independent variable, T.
NUM
30 I ENTER I
2 I ENTER I
[T|4 I ENTER I
py] fvl to highlight T
sSOLVE NUMEiilC VIEWS
ENTER VmUE Oli PRESS SOLVE
_______
Solve aplet
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