ular box with a square base is being constructed to hold a volume of 300 cm3. The material for the base and top of the container costs $6/cm2 and the material for the sides of the container costs $3/cm2. Find the dimensions of the cheapest

College Algebra
7th Edition
ISBN:9781305115545
Author:James Stewart, Lothar Redlin, Saleem Watson
Publisher:James Stewart, Lothar Redlin, Saleem Watson
Chapter1: Equations And Graphs
Section: Chapter Questions
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A rectangular box with a square base is being constructed to hold a volume of 300 cm3. The material for the base and top of the container costs $6/cm2 and the material for the sides of the container costs $3/cm2. Find the dimensions of the cheapest possible box.

Expert Solution
Step 1

Let x be the length of one edge and y be the height of the box.

The diagram is shown as:

Algebra homework question answer, step 1, image 1

The volume of the rectangular box with a square base  is ,

V=x2y.300=x2y.y=300x2. ..........................1

Step 2

The cost of material used for base and top of the container is ,

Ct=6x2+x2=12x2.

The cost of material used for sides of the container is ,Cs=34xy.

The total cost  of material used , Cx=Ct+Cs.

Cx=12x2+12xy.=12x2+12x300x2 ...............from 1.=12x2+3600x.

 

 

 

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