7Converting Decimals to Fractions Using the TI-83 we can convert decimals to nice fractions.From our last examplePush the “Math” buttonPush “Enter”Finally Push “Enter” again
8Graphing Example Graphing f(x)= 2x²-7x+3 *If you want to graph a functionpress the “Y=” button*You should get a screen that lookslike*Enter 2x²-7x+3 into this screen
9Graphing Example Enter 2x²-7x+3 by pushing “plus”, “3” Push “Graph” “2” , “Variable”, “x²”, “minus”,”7”. “Variable”“plus”, “3”Push “Graph”
10Graphing Example: Changing the View We can change the viewing window to get better viewPush the “Window” buttonChange Xmin and XmaxXmin=-3Xmax=5(Use arrow keys andclear buttons)Hit the “Graph” Button
11Solving the equation: 2x²-7x+3=0 When setting f(x)=0 we are looking for the x-intercept or the zeros(roots) (x-intercept , zero, root) (x-intercept , zero, root)
12Finding the zeros(roots) using TI-83 Press “2nd” and “Trace” buttonsThe screen should change to this..Go to the zero option and hit Enter.
13Finding the zeros(roots) using TI-83 The CPU is asking for a left bound. Move the “DOT” to the left side of one of the roots. Use the arrow keys to move the dot.
14Finding the zeros(roots) using TI-83 Jjjj roots(zeros)(2 roots in this example)The dot is now on the left side of one of the roots. Push Enter.The CPU is asking for a right boundMove the dot to the right side ofroot.
15Finding the zeros(roots) using TI-83 Kk (zero that we are trying to calculate)The dot is now on the right side of the root. Push Enter.The CPU is asking for a Guess?Push Enter again.
16Finding the zeros(roots) using TI-83 The CPU has calculated one of the roots to be 0.5Notice that the Y-Value =0.Y=0 is the definition of aX-intercept.Go find the other root.
17Finding the zeros(roots) using TI-83 Here is the other root.