Uh...how's this a proof? To prove something you need to start from scratch...this is just a way to justify the topic in the video...not a way to actually show that this is true. You used already existing exponential rules, without proving their existence throughout.
nice. But fyi, the video becomes blurred after about 30 sec
On your end, I am on a laptop and it looks fine.
try changing resolution
x^3 = x*x*x
x^(-3) = (x/x)/x
I... this isn't a proof, this is a justification for the *definition*. Negative exponents are just another notation for the same thing.
Uh...how's this a proof? To prove something you need to start from scratch...this is just a way to justify the topic in the video...not a way to actually show that this is true. You used already existing exponential rules, without proving their existence throughout.