Sharp EL-9600 User Manual download pdf (Page 47)

EL-9650/9600c/9450/9400 Graphing Calculator

9-2

There may be differences in the results of calculations and graph plotting depending on the setting.

Return all settings to the default value and delete all data.

Set the zoom to the decimal window:

(

)

Notes

Step & Key Operation

(When using EL-9650/9600c)

*Use either pen touch or cursor to operate.

Display

(When using EL-9650/9600c)

Solving Rational Function Inequalities

A rational function f (x) is defined as the quotient where p (x) and q (x) are two

polynomial functions such that q (x) ≠ 0. The solutions to a rational function inequality can

be obtained graphically using the same method as for normal inequalities. You can find the

solutions by graphing each side of the inequalities as an individual function.

Solve a rational inequality.

Example

Solve

≤

2 by graphing each side of the inequality as an individual function.

1 Enter y = for Y1. Enter y = 2

for Y2.

2 Set up the shading.

Since Y1 is the value “on the

bottom” (the smaller of the

two) and Y2 is the function

“on the top” (the larger of the

two), Y1 < Y < Y2.

View the graph.

Find the intersections, and solve the

inequality.

The intersections are when

x = -1.3, -0.8, 0.8, and 1.3.

The solution is all values of

x such that x

≤

-1.3 or

-0.8

≤

0.8 or x

≥

1.3.

Do this four times

The EL-9650/9600c/9450/9400 allows the solution region of inequalities to be

indicated visually using the Shade feature. Also, the points of intersections

can be obtained easily.

1 - x

1- x

ENTER

ZOOM

MATH

GRAPH

2nd F CALC

2nd F

DRAW

—

ALPHA

ENTER

———

/T/n

q (x)

p (x)

Before

Starting

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Sharp EL-9600 User Manual Page 47

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