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mathcalculus Group TitleBest ResponseYou've already chosen the best response.0
okay i understand everything..... except how to find the minimum!
 11 months ago

completeidiot Group TitleBest ResponseYou've already chosen the best response.2
are you familiar with derivative?
 11 months ago

mathcalculus Group TitleBest ResponseYou've already chosen the best response.0
i know they got the equation. y=6x+(21000/x)
 11 months ago

mathcalculus Group TitleBest ResponseYou've already chosen the best response.0
then after i'm not sure how they got: Minimum occurs at 59.16 ft for the length (found on a graphing calc) width: 10500/59.16 = 177.5 ft Perimeter = 710 ft
 11 months ago

completeidiot Group TitleBest ResponseYou've already chosen the best response.2
ok, well the method they got the minimum is just by using a graphing calculator with a max min function on it doing it manually would involve finding the first derivative of the equation and then setting it equal to zero and then solving for L
 11 months ago

completeidiot Group TitleBest ResponseYou've already chosen the best response.2
or x
 11 months ago

mathcalculus Group TitleBest ResponseYou've already chosen the best response.0
is there a way to do that without it?
 11 months ago

completeidiot Group TitleBest ResponseYou've already chosen the best response.2
without the graphing calculator? or without having to do it manually?
 11 months ago

mathcalculus Group TitleBest ResponseYou've already chosen the best response.0
by hand
 11 months ago

mathcalculus Group TitleBest ResponseYou've already chosen the best response.0
no calculator
 11 months ago

completeidiot Group TitleBest ResponseYou've already chosen the best response.2
by hand would involve finding the first derivative of the equation and then setting it equal to zero and then solving for L
 11 months ago

completeidiot Group TitleBest ResponseYou've already chosen the best response.2
because the slope at the minimum point is zero
 11 months ago

mathcalculus Group TitleBest ResponseYou've already chosen the best response.0
can you show me?
 11 months ago

mathcalculus Group TitleBest ResponseYou've already chosen the best response.0
im doing it wrong, even on calculator :/ I'm not getting it.
 11 months ago

completeidiot Group TitleBest ResponseYou've already chosen the best response.2
\[y = \frac{21000}{x} + 6x\] \[y' = \frac{21000}{x^2} +6\] \[y' =0\] \[0=\frac{21000}{x^2} +6\] solve for x hopefully i didnt screw up the derivative
 11 months ago

completeidiot Group TitleBest ResponseYou've already chosen the best response.2
\[\frac{1}{x} = x^{1}\]
 11 months ago

completeidiot Group TitleBest ResponseYou've already chosen the best response.2
any questions?
 11 months ago

Psymon Group TitleBest ResponseYou've already chosen the best response.0
@completeidiot derivative is fine :3
 11 months ago

mathcalculus Group TitleBest ResponseYou've already chosen the best response.0
yeah 1/x?
 11 months ago

completeidiot Group TitleBest ResponseYou've already chosen the best response.2
im just pointing out the identity that allows you to use the "power" rule for derivatives
 11 months ago

completeidiot Group TitleBest ResponseYou've already chosen the best response.2
\[y= x^n\] \[y' = nx^{n1}\]
 11 months ago

mathcalculus Group TitleBest ResponseYou've already chosen the best response.0
im not getting that. i got up to here: y=621000/x^2 then set it to 0
 11 months ago

mathcalculus Group TitleBest ResponseYou've already chosen the best response.0
then im lost
 11 months ago

completeidiot Group TitleBest ResponseYou've already chosen the best response.2
1/x is not part of the problem you can ignore it if you want its just that the identity is sometimes not obvious to other people
 11 months ago

completeidiot Group TitleBest ResponseYou've already chosen the best response.2
once you set it equal to zero 0=621000/x^2 just solve for x
 11 months ago

completeidiot Group TitleBest ResponseYou've already chosen the best response.2
6= 21000/x^2 x^2= 21000/6 x = sqrt {21000/6}
 11 months ago

completeidiot Group TitleBest ResponseYou've already chosen the best response.2
any other questions? sorry for any confusion i may have caused
 11 months ago

mathcalculus Group TitleBest ResponseYou've already chosen the best response.0
i got it=]
 11 months ago

mathcalculus Group TitleBest ResponseYou've already chosen the best response.0
thanks!
 11 months ago

completeidiot Group TitleBest ResponseYou've already chosen the best response.2
no problem
 11 months ago
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