A quick trick for computing eigenvalues | Chapter 15, Essence of linear algebra

How to write the eigenvalues of a 2×2 matrix just by looking at it.
Need a refresher on eigenvalues? https://youtu.be/PFDu9oVAE-g
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Lockdown math lecture talking about the mean product formula:

Timestamps:
0:00 – Background
4:53 – Examples
10:24 – Relation to the characteristic polynomial
12:00 – Last thoughts

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