limits with epsilon-delta definition! (linear, square root, and quadratic examples)

Here's the easy way to write epsilon-delta proofs for limits. Usually, the epsilon-delta definition is taught in college calculus 1 (or real analysis in upper-division pure math but not in AP calculus). I think it is the hardest topic in Calculus 1. Let me know what you think!
Check out the Introduction to εδ definition of the limit 👉    • epsilon-delta definition ultimate int...  
More examples of writing εδ proofs 👉   • How to do epsilon-delta definition? (...  

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0:00 proving limit of 1/2x+3 as x goes to 4
3:35 proving limit of sqrt(10-3x) as x goes to -2
8:16 proving limit of 3x^2+1 as x goes to 2

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