differentiate the function $$\ y=(3x+4)^{2} $$\ using the chain rule, i got 6(3x+4) but my book says 6(3x+1) ... who is right?

Question

anonymous · Answer

You

turingtest · Answer

yup ;)

mertsj · Answer

Sue the publisher.  You can become rich.

sasogeek · Answer

should i keep using that book? it has many examples i want to solve but this one and it's solution just seemed odd

mertsj · Answer

Sure as long as you have us to verify your work.

anonymous · Answer

It happens to all books. They sometimes have wrong answers. If they have a lot of incorrect answers you should stop, but otherwise it should be OK.

anonymous · Answer

Every book should come with errata.

earthcitizen · Answer

typo error mayb

sasogeek · Answer

well this is the 3rd one, the other two, i checked with my friend's answers, we had the same thing but the book was just wrong, but i've solved more than 200 questions from this book with many right answers other than these 3 so far

turingtest · Answer

a book is only viable if$$\frac{\text{errors}}{\text{pages}}\le 0.127$$(excess-typo theorem)

anonymous · Answer

Seems like a very unreliable book to me

slaaibak · Answer

aka less than 1 mistake total in 8 pages :D

turingtest · Answer

that's generous!

anonymous · Answer

Or one problem out of 8 per page.

anonymous · Answer

Why study from book OCW single variable is the best introductory  calculus course that I have seen.

sasogeek · Answer

it's just a book with thousands of problem sets and examples on many topics and my teachers recommend it because of it's many examples...

earthcitizen · Answer

does OCW have intro complex numbers?

anonymous · Answer

For book I like Thomas calculus, it's the best book that I have seen.

anonymous · Answer

Do you mean complex analysis? @EC

asnaseer · Answer

I would say it's more important for a book to have good explanations of the concepts rather than necessarily have all the answers printed correctly. But I agree, if there are too many mis-printed answers then it can put you off track.

anonymous · Answer

If asnaseer writes a book I will buy it.

earthcitizen · Answer

yh sound similar

asnaseer · Answer

sasogeek would be the editor and reject all my mis-printed answers :)

sasogeek · Answer

it's concepts are laid out correctly and explanations are just okay though i must say, they only seem to mess up with some answers

sasogeek · Answer

lol asnaseer

earthcitizen · Answer

yh I guess it's called complex analysis @FFM

anonymous · Answer

haha asnseer and we will ask myin to do the proof-reading

asnaseer · Answer

no - myininaya should be the illustrator :)

anonymous · Answer

@EC:I never searched, sorry.

sasogeek · Answer

hahahahaha so true asnaseer

anonymous · Answer

haha :D

earthcitizen · Answer

yh no p

turingtest · Answer

http://ocw.mit.edu/courses/#mathematics there are a couple of 'complex variables' classes I assume those are the same thing

earthcitizen · Answer

nice link @ TT, new stuffs too