Finding where graph intersect abscisa

[Gunjac]

Helo!

Please see attached file.

I have an piecewise linear function.

How can I program Marhcad to calculate where the graph intersects the abscisa?

For this case I have two values as you can see from the graph.

Please help

[RichardJ]

That is the only value. The graph also appears to cross at 1, but that connecting line should really not be there. The function is discontinuous, and jumps from a positive value to a negative value.

[Gunjac]

Yes thats correct, but how to detect this change in sign (+ --> - ) so that it also appears as a second solution?

Basicly at this point "graph" goes from +5 to -1

Maybe to change the piecewise linear function input somehow...but how?

[RichardJ]

Well, then the second "solution" would be 1. You don't need to solve anything to get that though, because it's how you defined the function.