Solve the given item on a separate sheet of paper. A rectangular box with open top and has a square base is a school project of two senior high school students. However, they are wondering what would be the minimum dimensions of their box if it will have a fixed volume of 62.5 cm.

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
Chapter9: Surfaces And Solids
Section9.1: Prisms, Area And Volume
Problem 40E: As in Exercise 39, find the volume of the box if four congruent squares with sides of length 6 in....
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Solve the given item on a separate sheet of paper.
A rectangular box with open top and has a square base is a school project of two
senior high school students. However, they are wondering what would be the
minimum dimensions of their box if it will have a fixed volume of 62.5 cm³.
Transcribed Image Text:Solve the given item on a separate sheet of paper. A rectangular box with open top and has a square base is a school project of two senior high school students. However, they are wondering what would be the minimum dimensions of their box if it will have a fixed volume of 62.5 cm³.
Solution
Steps
1. Draw a diagram. List what is asked
on the problem and label the
diagram with relevant data.
Constraint equation:
2. Write the constraint and the
optimization equations.
Optimization equation:
3. Substitute the constraint equations,
to the corresponding
length, width and height of the
optimization equation.
4. Simplify and take its first derivative.
5. Set the equation to zero and solve for
the x value (critical point).
6. If there are two critical values, we
have to check which one will give a
sensible answer by substituting
them to the volume equation.
7. Test the x value. Substitute it to the
second derivative and check
whether the answer is less than or
greater than zero.
8. Substitute the maximum x value to
the simplified constraint equation to
solve for / and w.
height
length =
width
9. Solve for the dimensions.
Transcribed Image Text:Solution Steps 1. Draw a diagram. List what is asked on the problem and label the diagram with relevant data. Constraint equation: 2. Write the constraint and the optimization equations. Optimization equation: 3. Substitute the constraint equations, to the corresponding length, width and height of the optimization equation. 4. Simplify and take its first derivative. 5. Set the equation to zero and solve for the x value (critical point). 6. If there are two critical values, we have to check which one will give a sensible answer by substituting them to the volume equation. 7. Test the x value. Substitute it to the second derivative and check whether the answer is less than or greater than zero. 8. Substitute the maximum x value to the simplified constraint equation to solve for / and w. height length = width 9. Solve for the dimensions.
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