Expression for combined area of triangle and square | Differential Calculus | Khan Academy

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Differential calculus on Khan Academy: Limit introduction, squeeze theorem, and epsilon-delta definition of limits.
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[@user-vo4sx8ic6n]

Dear teacher, Can you please tell me which software you are using? I want to use this kind of software into my teach experience.

[@boxguy123]

Thanks

[@DutchmanDavid]

His drawing software is Smoothdraw 3, I think.

[@wana4469]

In 3:52, how did the answer becomes 3s2/4?
Anyone please help me. Thank you.

[@jetpaq]

agreed. I can get down and dirty with some friends of mine for tutoring! Salmon sir, no homo... but dude i loVe you!