[Prev][Next][Index][Thread]
Re: A92: a92-a lot of questions
{{What answer does your calc give?}}
not the correct one..i've already found the answer to the integral part
of the equation (in true calculus ways and my methods combined) and
found that the answer the calc gives isn't the same. i even assigned
both of them equal to each other and solved, both of them came out
unequal.
here:
integral(x^2*(x+1)^(1/2),x) is suppose to give:
2x^2*(x+1)^(3/2)/3-8x*(x+1)^(5/2)/15+16*(x+1)^7/2)/105
you can check that by taking the derivative and getting the above, but
the calculator gives this answer:
2x^2*(x+1)^(3/2)/7-8x*(x+1)^(3/2)/35+16*(x+1)^(3/2)/105
if you think that the above two equations are the same then take the
derivative of this one and see for yourself, you'll notice that it
doesn't come out equal (if the calculators are the same as mine).
i'm calling this error RCD error (my name Rob Caldwell and D=derivative)
just for naming purposes (since everybody likes to name everything they
find). until someone proves me wrong (you'll have to convince me by
coming to my house and showing me on MY calculator) then i'll say that i
was BSing the whole thing (but i'm not).
if anyone else has the RCD error post about having it.
-Rob
president
RCWare
Scratch Designs
______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com
Follow-Ups: