EL-9900 Graphing Calculator

Step & Key Operation

1-5Solve for the height and enter a starting point of 1.

2nd F EXE 1 ENTER

DisplayNotes

Newton's method will prompt with a guess or a starting point.

1-6Solve.

2nd F EXE ( CL )

2 Save this formula. Give the formula the name “A TRAP”.

2nd F SOLVER C ENTER

A SPACE T R A P ENTER

3-1Recall the formula for calculating the area of a trapezoid.

2nd F SOLVER B

0 1

3-2Enter the values:

A = 50, B = 8, C = 10.

ENTER 5 0 ENTER 8

ENTER 1 0 ENTER

3-3Solve.

2nd F EXE 1

ENTER 2nd F EXE

The answer is : h = 4.17

The answer is : h = 5.56

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 in the Solver mode. If a starting point is known, Newton's method is useful for quick solution of a complicated equation.

5-3

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Sharp EL9900 manual 5Solve for the height and enter a starting point