uTo solve an equation1.On the Numeric Solver window, input an equation.

Here, we will input the equation y = x2 − 2, and solve for x when y = 0 and y = 2.

2.Press E.3.Input 2 as the values for variable y (to the right of y=).

4.Since we want to solve for x, select the option button to the left of variable x (so the button next to the variable becomes ).

5.Tap 1.

This displays the Result dialog box with the calculation result. Tap [OK] to close the dialog box.

6.Input 0 as the values for variable y (to the right of y=).7.Tap 1.

Though the solution of x2 − 2 = 0 is x = ±2, here the value that is displayed is the decimal form of 2, which is near the last solution obtained (x = 2).

To obtain the other solution, change the Upper value (to 0, for example) and then tap 1.

0901 t is the time it would take for an object thrown straight up with initial velocity v to reach height h. Use the formula h = vt − 1/2 gt2 to calculate the initial velocity v for a height of h = 14 meters and a time of t = 2 seconds. Gravitational acceleration is g = 9.8 m/s2.

Tip

If ClassPad judges that the displayed results are not converging sufficiently, it displays the message “Did not converge. Do you wish to continue the calculation?” Tap [Yes] to continue, or [No] to cancel the calculation.

If the message “Can’t solve!” appears on the display, perform either (or both) of the operations below and then tap 1 again.

-Tap a- [Initialize Bound], or manually change the “Lower” and “Upper” values.

-Change the convergence range. See “To change the convergence range” below.

uTo change the convergence range1.Tap a- [Convergence] to display the Convergence dialog box.2.Enter an integer in the range of 1 to 13.

A smaller value increases the allowable error range, and lessens the chance of a “Can’t solve!” error. If a calculation causes a “Can’t solve!” error, try changing this setting to a smaller value.

3.Tap [OK] to apply the setting and close the dialog box.The new setting value will be shown in the status bar (page 171).

Chapter 9: Numeric Solver Application

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