Graphing Parabolas With Microsoft Excel


 Eugenia Lloyd
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1 Graphing Parabolas With Microsoft Excel Mr. Clausen Algebra 2 California State Standard for Algebra 2 #10.0: Students graph quadratic functions and determine the maxima, minima, and zeros of the function. STEP 1 Create A Table Of Points Save your Excel file as LASTNAME FIRSTNAME Parabolas, and save this in your S: network directory. Do not save your work on the local hard drive C:! Set up your Excel spreadsheet to make a chart of points for a parabola. The equation we'll be modeling in this lesson is: y = 0.5x 2 x 2.5 or y = 0.5*x^2 x 2.5 as it would be written for a computer. In standard form the equation of this parabola would be: y = 0.5(x1) 2 3 or y = (1/2)*(x 1)^2 3 as it would be written for a computer. 1. Open Microsoft Excel. In cell A1, type this text: Graph of y = 0.5(x1) 2 3. You may enter the general form of the equation if you wish instead of the standard form. Remember to make the number 2 an exponent. To do this, click in cell A1, highlight the number 2 in the formula bar, and use the menu, Format, and then Cells and check the Superscript check box. In cell D1 Type your Last Name, First Name and ID number. 2. In cell A2, type x. In cell B2, type y. 3.Since the vertex for this problem is (1, 3), we would like three points on either side of the axis of symmetry. We will use the points 2 through 4. Page 1
2 In cells A3:A9 (this notation means in cell A3 through cell A9), enter a sequential series of values from 2 through 4 (see above). Type each value without using a formula. If you are given a parabola in general form, and don t know what the vertex or axis of symmetry is, try entering values from 10 to 10 for your x values. You will likely get some very large y values. But when you graph as in Step 2 below, you don t have to select all of the x and y values. Select the x and y values that will give you a nice graph without really large y values. 4. Select A2:A9 (click on cell A2 and drag through cell A9), press CTRL, SHIFT, F3, and name this column x (see above) by clicking OK. You could use the Insert menu / Name / Define and define a name instead, but Control Shift F3 is faster and easier. 5.In cell B3, enter the formula for y, which is = (1/2)*(x 1)^2 3, or you could enter the formula: = 0.5*x^2 x 2.5, if you prefer the general form of the parabola instead. Copy this formula and paste it in cells B4:B9. STEP 2 Graph the Equation We want to see what our equation looks like by creating a graph. Page 2
3 1.Select cells A2:B9. 2.Select the Insert Menu, choose Chart, Select the XY (Scatter) Chart type and then select the Chart subtype that I have selected in black above. 3. Click the Next button on the Chart Wizard twice. 4. Click on the Titles Tab and enter the information below. 5. Click on the Gridlines Tab and check both boxes labeled Major gridlines as shown below. Page 3
4 6. Click on the Legend Tab and deselect the Show legend box. 7. Click on the Data Labels Tab and choose Show value as illustrated below. 8. Click the Next button and then click the Finish button Page 4
5 9. Customize your graph as you wish. STEP 3 Find The Zeros, Solutions, or Roots of the Equation 1. Look at the y values in your spreadsheet. Notice that when x = 2, y = 1.5 and when x = 1, y = 1. Since y moves from positive 1.5 to a negative 1, the graph must cross the xaxis to do this. This means that the graph crosses the xaxis between 2 and 1 and one of our zeros, roots or solutions is located in this interval. This concept is known as the Location Theorem. Notice also that the graph crosses the xaxis between 3 and 4 too. There are many mathematical methods to zoom in and find out more accurately where these solutions, roots or zeros occur, but we will use the power of Microsoft Excel to find these zeros for us. (Be aware that some parabolas never cross the xaxis, so we will not be able to find any zeros. Look at your graph for visual clues whether your parabola crosses the xaxis before following these steps.) 2. Select cells A3:B9. Go to the Format menu, choose Cells., make sure that the Number tab is selected, choose Number in the Category box, and choose 2 decimal places as shown below. Page 5
6 3. Highlight one of the yvalue cells that is on either the positive or negative side of where your graph crosses the xaxis (cell B3 or B4 in our example.) 4. Go to the Tools Menu, and choose Goal Seek In the dialog box that appears, enter 0 (zero) in the To Value box, and type the name of the cell to the left of the cell listed in the Set cell text box. In our example, I clicked on cell B4 and typed cell A4 in the box labeled By changing cell: as shown below. After you have entered these values, click OK. 5. In cell A4, in our example, you will now find the first occurrence of where your graph crosses the xaxis, or the first zero, root or solution. Page 6
7 6. Repeat this process to find the other zero of the function in the interval between 3 and 4 for the x values. 7. In an empty cell in column A and below your graph (cell A18 in my example), type the word: Zeros: In the two cells immediately to the right type the values (numbers) of the two zeros you found in steps #16. (In my example, I typed in cell B18 and 3.45 in cell C18.) STEP 4 Find The Vertex, and Maximum or Minimum of the Equation 1. In order to do this part of the exercise, Microsoft Excel has to be set up a certain way. We need to use an add in for Excel called Solver for this next part. Make sure that you save your work before doing the following directions just in case something goes wrong. First, let s check to see if Solver is already set up and ready to go. Go to the Tools Menu and see if the choice Solver is in the list. If it is, you re ready to go to the next step. If you don t see Solver, then from the Tools Menu, take the choice AddIns A dialog box should appear. Scroll through the list looking for the choice Solver Addin. If it appears in the list, click the check box and then click OK as shown in the picture below and you are ready to go to the next step. If Solver Addin is not there, you won t be able to do the following directions to finish this exercise. 2. In column A, below the cell where you typed Zeros:, type the label Vertex:. In our example that is in cell A19. To the right of that cell (in cell B19 in our example), type any one of the x values from our Page 7
8 table of points from Step 1. I will just type 10, as any number will do. 3. In the cell to the right of that (cell C19 in our example) you will need to type a formula using the real name of a cell rather than the defined name, x. In my example the formula is: =(1/2)*(B191)^2 3. If you are not using the same cells as I am, you will have to replace the B19 in the formula with the column letter and row number that contains the number that you typed in step 2 above. 4. Highlight both cells (B19 and C19 in my example) and use the Format Menu, Cells to format these cells as numbers with 2 decimal places as we did in Step 3 Point 2 above. 5. Select cell C19 in my example or whatever cell you entered the formula in Point 3 above. From the Tools Menu, choose Solver A dialog box will appear. Fill it in exactly as shown below. You must type $C$19 in the Set Target Cell box, type $B$19 in the By Changing Cells box. Since the parabola opens up the graph has a minimum. Make sure that the Radio Button Min is selected. (If the parabola opened down, you would select the Max button.) Then click Solve. 6. Another dialog box will appear as shown below. Excel correctly found our vertex, which is the point (1, 3). Since this is correct, click the radio button Keep Solver Solution and click OK. Page 8
9 7. Remember that the maximum or minimum of any parabola is the yvalue of the vertex. If the parabola opens up, it has a minimum. If the parabola opens down, is has a maximum. So in our example, the parabola y = 0.5(x1) 2 3 has a minimum of 3. The last thing we need to do to our example is to type in cell A20 (in my example) the word Minimum. In cell B20 (in my example) type the number 3. (Don t copy and paste the number from our row containing the vertex. If you absolutely must copy and paste, you can copy, but you must use the Paste Special feature, and select values.) STEP 5 Repeat all of the above for your next equation(s). 1. To graph your next parabola(s), repeat the preceding steps except that you must use different letters for x and y. Use a and b for the second equation, d and e for the third equation, etc. Excel won t let you define the same letters on the same spreadsheet and for some reason doesn t like the letter c or the letter r (I am guessing that c and r are probably internal variables in Excel for row and column. 2. Make sure that you save your work as LASTNAME FIRSTNAME Parabolas, and save this in your S: network directory. Do not save your work on the local hard drive C:! 3. When you are sure that everything is correct and that you have used formulas to generate all of the y values, then copy and paste your Excel file into the W directory. Don t use the File Menu and Save As option, this will NOT save the entire file due to a conflict between Microsoft Excel and our Novell Server Software. Page 9
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