Sharp EL9900 manual 10π, 200 15 π

EL-9900 Graphing Calculator

Step & Key Operation Display Notes

1-5Set the variable range from 0 to 2.

0 ENTER 2 ENTER

The graphic solver will prompt with a variable range for solv- ing.

r 2 =	30	=	3	<3
	10π		π

r =1 ➞ r 2 = 12 = 1 <3 r =2 ➞ r 2 = 22 = 4 >3

1-6Solve.

2nd F EXE ( CL )

2 Save this formula.

Give the formula the name “V CYL”.

2nd F SOLVER C ENTER

V SPACE C Y L ENTER

3-1	Recall the formula.
	Enter the values: V = 200, H = 15.
	2nd F	SOLVER			B	0	1
				0		0		0
	ENTER		2				ENTER		ENTER

1 5 ENTER

3-2	Solve the radius setting the variable
	range from 0 to 4.
							0		4
			2nd F		EXE			ENTER
		ENTER		2nd F		EXE

Use the larger of the values to be safe.

The solver feature will graph the left side of the equation (volume, y = 30), then the right side of the equation (y = 10r 2), and finally will calculate the intersection of the two graphs to find the solution.

The radius is 0.98 in.

r 2 =	200	=	14	< 14
	15π		π

r= 3 ➞ r 2 = 32 = 9 < 14 r = 4 ➞ r 2 = 42 = 16 > 14

Use 4, the larger of the values, to be safe.

The answer is : r = 2.06

One very useful feature of the calculator is its ability to store and recall equations. The solution from various values for known variables can be easily obtained by recalling an equation which has been stored and giving values to the known variables. The Graphic method gives a visual solution by drawing a graph.

5-2