### III. Working With Graphs

E. F5 - Math

2:Zero Finds the x-intercept in a designated interval. This is very useful when solving equations.

Example: Find a root of the equation . When you enter the left and right bounds, try to enter values that are relatively close to the zero so that other variations in the graph do not impede the process. Make sure that the bounds are on opposite "sides" of the zero. You can enter the bound directly or you can use the cursor to scroll to a value.

 Press to access the Y=Editor. Press and set the window shown. Press to draw the graph. Press and select option 2:Zero. Enter -2 as the lower bound. Enter -1 as the upper bound. The zero is shown below. Find the other zero using the same process.

Notice that the zero is given as x=-1.732051 and the y-value is given as y=4.E-13 which is the scientific form for y=0.0000000000004. This is essentially zero.

 1:Value 2:Zero 3:Minimum 4:Maximum 5:Intersection 6:Derivatives 7:Integrals 8:Inflection 9:Distance A:Tangent B:Arc C:Shade
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 I. Entering Graphs II. Windows & Styles III. Working with Graphs IV. Special Graphs V. Other Graph Modes