Proof by contradiction

The second of 2 videos on proof - here we have proof by contradiction. This is a very powerful technique which involves proving that the opposite of a statement can't be true. I cover 5 examples, each full of tips and tricks which you may use again in similar problems.
Enjoy!
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[@MATHSEXAMADDAbykaranverma]

nice mam i am from India .....i like your videos very much.

[@sachinpundir6185]

Thanks Mam

[@valeriacarrillo9193]

cheers brilliant thank you

[@wellingtonsiankuku3669]

Great

[@DigitalGnosis]

Galileo has a cool proof by contradiction as to why the Aristotelian theory of gravity is wrong. On my phone now but might put it in the comments later if I remember

[@verondela6510]

I want u to help me prove by contradiction that root 2 plus root 6 is less than root 15