Is there way to detect that function gives error, or more accurately when Solve() gives "No real roots" error?

Wrote

Is there way to detect that function gives error, or more accurately when Solve() gives "No real roots" error?

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Most likely that is because your solve range does not bracket the
function crossing Xaxis. Before solving, always plot.
Don't be shy, attach the work sheet, just minute job to tutor it back.

Jean

I think you don't understand what I wish to know. Let me rephrase my question is: is there a way to detect that two functions are NOT CROSSING without error. I was thinking maybe there is a function that detects errors so I could write something like: If_Error(Solve(f1(x);f2(x),x))= 1 if f1 and f2 are not crossing.

Wrote

I think you don't understand what I wish to know. Let me rephrase my question is: is there a way to detect that two functions are NOT CROSSING without error. I was thinking maybe there is a function that detects errors so I could write something like: If_Error(Solve(f1(x);f2(x),x))= 1 if f1 and f2 are not crossing.

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Your question is now different, but the answer is same: plot your functions, doing that
you will kow the bracket range for root(s),i.e: the abscissa where they cross each other.

Again: attach your work sheet, few seconds job I will return,
but I visit this forum only at night [generally every day].
If you agree to attach your work sheet, I will catch it sooner.

Jean

Wrote

I think you don't understand what I wish to know. Let me rephrase my question is: is there a way to detect that two functions are NOT CROSSING without error. I was thinking maybe there is a function that detects errors so I could write something like: If_Error(Solve(f1(x);f2(x),x))= 1 if f1 and f2 are not crossing.

You can assign the result of solve to a variable and check if that variable is defined. If not, you can check lastError.