HP Prime Graphing Wireless Calculator Instrukcja Użytkownika Strona 344

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NOTE: Some variables may already have values against them when you display the Numeric view. This
occurs if the variables have been assigned values elsewhere. For example, in Home view you might have
assigned 10 to variable U by entering 10, tapping , and then entering U. Then when you open the
Numeric view to solve an equation with U as a variable, 10 will be the default value for U. This also occurs if a
variable has been given a value in some previous calculation (in an app or program).
To reset all prepopulated variables to zero, press .
Solving for the unknown variable
To solve for the unknown variable A, move the cursor to the A box and tap .
Therefore, the acceleration needed to increase the speed of a car from 16.67 m/s (60 kph) to 27.78 m/s (100
kph) over a distance of 100 m is approximately 2.4692 m/s
2
.
The equation is linear with respect to the variable A. Hence you can conclude that there are no further
solutions for A. This is also visible if you plot the equation.
Plotting the equation
The Plot view shows one graph for each side of the solved equation. You can choose any of the variables to be
the independent variable by selecting it in Numeric view. So in this example make sure that A is highlighted.
The current equation is V
2
= U
2
+ 2AD. The plot view will plot two equations, one for each side of the equation.
One of these is Y = V
2
, with V = 27.78, making Y = 771.7284. This graph is a horizontal line. The other graph is
Y = U
2
+ 2AD with U = 16.67 and D = 100, making, Y = 200A + 277.8889. This graph is also a line. The desired
solution is the value of A where these two lines intersect.
1.
To plot the equation for variable A, press .
2. Select Auto Scale.
296 Chapter 14 Solve app
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