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Need some help with data management

MaksimusMaksimus Member Posts: 1
Hi all,

First of all I have gathered some data from my experiments witch looks something like this:
Now I do a linearization for my data using Matlab command:
Results looks like this:
Now I do a interpolation using for example 5th order poly and get this:
I calculate the peak value and calculate -3dB value of peak value and get a line as you can see in the image:

Now my question is, what is the fastest and the best function to find the intersection x values of the 5th order polynomial and the line?

Thank you for your answers in advance,
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