Chalkboard Math  Printable Version + HP Forums (https://archived.hpcalc.org/museumforum) + Forum: HP Museum Forums (https://archived.hpcalc.org/museumforum/forum1.html) + Forum: Old HP Forum Archives (https://archived.hpcalc.org/museumforum/forum2.html) + Thread: Chalkboard Math (/thread168507.html) 
Chalkboard Math  Chuck  06102010 The recent thread about the chalkboard math from the movie "The Day the Earth Stood Still" reminded me of a photo from the current Discover magazine (July/August) advertising a calculus course. I asked my son (recent AP calc student) what was wrong in this picture. Took him about 5 seconds to see the omission. Not that I'm perfect on a chalkboard (or white board) either, but it's a fun pasttime to spot these things. Any others out there? CHUCK
Re: Chalkboard Math  Bill Zimmerly  06102010 I believe the middle formula should be
Re: Chalkboard Math  Karl Schneider  06102010 Quote: The derivation looked fine, assuming that the function was f(x) = x^{2}. Was it the missing hash mark from the second "f(x)"?  KS
Edited: 10 June 2010, 1:23 a.m.
Re: Chalkboard Math  Vieira, Luiz C. (Brazil)  06102010 Quote:I´d have mentioned the same thing... mostly because the thread refers to an omission. The second line of the derivative evaluation should start with f'(x)=instead of f(x)= Luiz (Brazil)
Edited: 10 June 2010, 7:51 a.m.
Re: Chalkboard Math  Walter B  06102010 FWIW, I concur d:)
