Casio Fx-CG50 Manual de usuario

QUICK START GUIDE

fx-CG50

Thestatusbarwilldisplaymessagesandcurrentstatuslikebatterylevel,anglemode,fractionresults,complex

mode,or input/output settings.

Thefunction keys allowyou to access the tab (soft key) menus that appear at the bottom ofthescreen.

Whenan (>) appears abovethe u key,selecting uwill offer more on-screen choices.

The pkeydisplayseverymodethecalculatorhas.To selectamode,press $Nto thedesirediconand

press lor pressthe numberor letterin theupper righthand cornerof the icon.

The d key operates like the back arrow on a web browser; it will take you back one screen

each time you select it. The d key will not take you to the icon menu.

The Lkeyactivates anyfunction displayed on or above the calculator buttons that is yellow. For

example, tofindthe square root of anumber, you would needtopress L,then s.L5givesyou access

to on-screen colorformatting.

The Okey will power the unit on. To turn the unit off, press L O.

The a key activates any function displayed on or above the calculator buttons

that is in red. For example, to type the letter A, press a,then f.

The l key executes operations. When data is entered, the l button must be

pressed to store the data.

Selectthedesired icon by highlightingit and pressing lor pressingthe numberor letterin

theupper right corner.

The following explains the meaning of each icon on the fx-CG50 icon menu

Icon Menu Name Description

RUN-MATRIX This icon menu is used for general computations, including

binary, octal, decimal, and hexadecimal functions and matrices.

STATISTICS This icon menu is used to perform single-variable (standard deviation) and paired variable

(regression) statistical calculations, to perform tests, to analyze data and to draw statistical

graphs.

This icon menu lets you input text, math expressions, and other data in a notebook-like interface.

eACTIVITY Usethismodewhenyouwanttostoretext,formulas,orbuilt-inapplicationdatainafile.

SPREAD- This icon menu is used for creating spreadsheets.

SHEET

GRAPH Thisicon menuis usedtodraw, storeandcalculate information fromfunctions.

DYNAMIC

GRAPH Thisiconmenuisusedtostoregraphfunctionsandtodrawmultipleversionsofagraphby

changingthevaluesassignedtothevariablesinafunction.

This icon menu is used to store functions, to generate a numeric table of different solutions

TABLE asthevalues assigned tovariables inafunctionchange, andtodraw graphs.

RECURSION Thisiconmenuisusedtostorerecursionformulas,togenerateanumerictableofdifferent

solutions as the values assigned to variables in a function change, and to draw graphs.

CONIC

GRAPH Thisiconmenuisusedtographparabolas,circles,ellipses,andhyperbolas.Conicsectionscan

beinputtedasrectangularfunctions,polarcoordinates,orparametricfunctionsforgraphing.

This icon menu is used to solve linear equations with two through six unknowns,

EQUATION andhigh-orderequationsfrom2ndto6thdegree.

2fx-CG50QuickStartGuide

The following explains the meaning of each icon on the fx-CG50 icon menu

Icon Menu Name Description

PROGRAM Thisiconmenuisusedtostoreprogramsintheprogramareaandtorunprograms.

FINANCIAL This icon menu is used to perform financial calculations

and to draw cash flow and other types of graphs.

This icon menu is used to control the optionally available EA-200 Data Analyzer. For information

E-CON4 aboutthis iconmenu,download theE-CON manualfromhttp://edu.casio.com.

LINK Thisiconmenuisusedtotransfermemorycontentsorback-updatatoanotherunitorPC.

MEMORY Thisiconisusedtomanagedatastoredinmemory.

This icon menu is used to initialize memory, adjust contrast, reset memory, and to manage

SYSTEM other system settings.

GEOMETRY Thisiconmenuallowsyoutodraw,analyzeandanimategeometricobjects.

PICTURE

PLOT

This icon menu allows you to plot points (that represent coordinates) on the screen

and then perform various analysis based on the plotted data.

3D GRAPH This iconmenuallows you todraw3-dimensional graphs.

CONVERSION

This icon menu indicates the “Metric Conversion' add-in application is installed.

To do conversions, go to the Run-Matrix icon and press i.

fx-CG50 Quick Start Guide 3

RUN-MATRIX

Forbasiccalculations,likethosethatcanbedoneonascientificcalculator,usetheRun-Matrixmenu.FromtheMainMenu,pressLJJ.

Toselecthowcertaincommandsandresultswillbeinterpretedordisplayed,pressLp(SET UP).ForInput/ Output,selectMath fornaturaldisplayoffractions,

radicalsandotherexpressions.ForFrac Result,selectd/c forafractionresultasthedefaultorab/c foramixednumberasthedefault.ForAngle,selectDeg or

Rad fordegreesorradians.

Note: the status bar at the top of the screen displays the selection for some of these options.

1.Evaluate23

Press Lb(...) jc c4c+b5cEl. To see the result as a mixed number, press Lv(a--4).To see the result as a decimal,

press v.

+ .

4fx-CG50 QuickStartGuide

Press LsS18l. To see the result as a decimal, press v.

2. Simplify .

RUN-MATRIX

3.Add48and24.Then,divideby2.Finally,subtractfrom56.

The purposeof this example is to demonstrate the Ans key. Ans representsthe previous

answer. Press 48+24l.Then, press M2l. Ans appearsautomatically when anoperation symbol

is pressed. However, Ans has to be pressedfor the subtraction part. Press 56-Ln(Ans)l.

fx-CG50 Quick Start Guide 5

GRAPH

Toconstructgraphs and usegraphicalanalysiscommands,usetheGraphmenu.FromtheMainMenu,press5.

The first screen is the function/relation editor. To selecthow certainresults willbe displayed, press Lp

(SET UP).ThesuggestedselectionsforCoord, Grid, Axes and Label are shown.Scrolldown to theseselections.

To makeachange, highlight the itemand usethefunctionbuttonthatappears directlybelowthedesiredtab.For

example, when Coord is highlighted, q(On) will turn coordinates on and w(Off) will turn coordinates off.

Press d to return to the editor.

TheMathClubplanstosellt-shirts.Previousexperiencesuggeststhatthenumberoft-shirtssolddependsontheprice.Agoodmodelforthenumbersold,

y,asafunctionoftheprice,x,isy=-2x+40.

1.Constructagraphofthisequation.

To construct a graph of this model, press n2f+40l.To select the view window, press Le(V-Window).Change the values for the window, as

shown, pressing l after each value. The values for Scale determines the location for the marks on the axes and the gridlines. Press d to

return to the editor.

To draw the graph, press u(DRAW). When a graph is displayed the + key can be used to zoom in, the - key to zoom out,

and$!BN to scroll.

6fx-CG50QuickStartGuide

GRAPH

2. Howmanyshirtswouldbesoldatapriceof$12pert-shirt?

To trace on the graph, press Lq(Trace).Use $! to move the cursor. To select a specific value, type the value, in this case 12. A dialogue

box opens, press l. To mark a point and keep the coordinates on the display, press l a second time.

1. Thereisapricethatistoohigh,meaningnoshirtsaresold.Thispointoccursatthex-interceptofthegraph(wherey=0)andthevalueofxisarootof

theequation2x+40=0 .

To find the root, press Ly(G-Solv)q(ROOT). The result, $20, is shown at the bottom of the screen. To mark this intercept and keep

the coordinates on the display, press l a second time.

4. If 2x +40 shirts are sold at price, x, then the number of dollars collected for the sale is x(2x +40) or 2x2

+40x .

To graph this function, first, deselect the previous equation by pressing d, B so the cursor is on Y1, then press

q(SELECT)N. Note, the = sign is not highlighted. The cursor should now be on Y2. Press n2fs+40fl.

fx-CG50 Quick Start Guide 7

GRAPH

To set up the view window, press Le(V-Window).Change the values for the window so that Ymax is 250 and Yscale is 50. Press d to return to the

editor. To draw the graph, press u(DRAW).

5.Computethenumberofdollars earned, ifeacht-shirtissoldat$12.

To compute the number of dollars earned if shirts are sold for $12, press Lq(Trace).Type the value, in this case 12. A dialogue box

opens, press l. The models predict that at a price of $12, 16 shirts will be sold for a total of $192.

6.Determinethepricethatwillgivethegreatestprofit.

To determine the price that is predicted to make the most money, press Ly(G-Solv)w(MAX). The results, $10 and $200, are shown at the bottom of the

screen.To markthepointand keepthecoordinateson thedisplay,pressl.

8 fx-CG50QuickStartGuide

GRAPH

7.Determinethepriceofeacht-shirtinordertocollect$150.

To determine the price of each t-shirt, in order to collect a total of $150, press IJ J(G-Solv) J () J(X-CAL)IJJ J J J. (The ()

symbol moves to the next page of commands.)

There is another point where y = 150. Use c to move to the next point. Press l to mark one or both of these points. $150 can be earned

by selling shirts at $5 or at $15.

8.FindtheintersectionoftheequationsinY1 and Y2.

Althoughit is notparticularlymeaningfulinthisexample,acommonproblemis to findtheintersectionpointof twographs.Pressdtoreturnto theeditor.Highlight

Y1 and press q(SELECT). Now, both graphs will be drawn. Press u(DRAW). To find the intersection points for the two graphs, press y(G-Solv) J(INTSECT). 38

shirtsare soldat thepriceof $1,foratotalof $38.(Thesegraphs alsointersectat (20,0)where no shirtsweresold.)

fx-CG50 Quick Start Guide 9

TABLE

1.Construct atableofvaluesthatshowstheprice,numberofshirts,andtotaldollars usingincrementsof$0.50.

Toconstructtables,fromtheMainMenu,press7.Theequationsforthefunctionsappeariftheyhavebeenpreviouslyentered,includingthoseenteredinthe

Graphmenu.

To set the initial value, end value and the increment, press y(SET). Enter the values for Start, End and Step. Press lafter entering each value,

then press d. To display the table, press u(TABLE). Use N to scroll through the table.

Note:valuesinthex-columncanalsobechanged manually.Pressanyvaluedesired,then pressl.Here,thevalue of 3 was changed to 7.

10fx-CG50 QuickStartGuide

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