A box with a square base and open top must have a volume of 78732 cm'. We wish to find the dimensions of the box 3 ст that minimize the amount of material used.

Mathematics For Machine Technology
8th Edition
ISBN:9781337798310
Author:Peterson, John.
Publisher:Peterson, John.
Chapter64: Volumes Of Spheres And Composite Solid Figures
Section: Chapter Questions
Problem 23A: A seamless brass tube and brass flange assembly is shown. The tube is pressed fit into the full...
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A box with a square base and open top must have a volume
of 78732 cm'. We wish to find the dimensions of the box
that minimize the amount of material used.
First, find a formula for the surface area of the box in terms
of only x,
[Hint: use the volume formula to express the height of the
box in terms of x.]
Simplify your formula as much as possible.
the length of one side of the square base.
A(x) :
Next, find the derivative, A'(x).
A' (x)
Now, calculate when the derivative equals zero,
when A'(x) = 0. [Hint: multiply both sides by x*.]
that is,
A'(x) = 0 when x =
We next have to make sure that this value of x gives a
minimum value for the surface area. Let's use the second
derivative test. Find A"(x).
A"(x)
Evaluate A"(x) at the x-value you gave above.
Transcribed Image Text:A box with a square base and open top must have a volume of 78732 cm'. We wish to find the dimensions of the box that minimize the amount of material used. First, find a formula for the surface area of the box in terms of only x, [Hint: use the volume formula to express the height of the box in terms of x.] Simplify your formula as much as possible. the length of one side of the square base. A(x) : Next, find the derivative, A'(x). A' (x) Now, calculate when the derivative equals zero, when A'(x) = 0. [Hint: multiply both sides by x*.] that is, A'(x) = 0 when x = We next have to make sure that this value of x gives a minimum value for the surface area. Let's use the second derivative test. Find A"(x). A"(x) Evaluate A"(x) at the x-value you gave above.
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