Use the root solver to locate where a function crosses the x-axis. For example, find some of the roots of a sinusoidal signal.
Using root with an Interval
1. To insert the root function, on the Functions tab, in the Functions group, click Solving. The Solving list opens. Select root. The root function appears labeled as a keyword.
2. Type an argument in each placeholder, and then evaluate the function.
root searches for a solution in the specified interval 4 < x < 8. The solution is slightly greater than 6, as expected from the plot.
With root, you can find the roots of a function with one unknown only.
Using root with a Guess Value
Instead of working with intervals, you can define a guess value and then call root. As for solve blocks, the guess value is the point where root starts its solving routine.
1. To find the root directly to the left of the origin, start with a guess value of -4.
2. Type the following expression.
3. To find a root to the right of the origin, define a new guess value.
4. Evaluate the root of sine. A different result is returned.
