(a)
To Find: The maximum value.
(a)

Answer to Problem 75E
Maximum volume is 1024
Explanation of Solution
Given: An open box of maximum value is to be made from a square piece of material, 24 cm on a side, by cutting equal squares from the corners and turning up the sides.
The table shows the volume of the box for various heights x .
The maximum value from the table is 1024 , corresponding to x=4
(b)
To Plot: The plot the points from the table. Does the relation defined by the ordered pairs represent V as a function of x .
(b)

Answer to Problem 75E
Yes the relation is a function.
Explanation of Solution
Given: An open box of maximum value is to be made from a square piece of material, 24 cm on a side, by cutting equal squares from the corners and turning up the sides.
The table shows the volume of the box for various heights x .
The graph by plotting the points is shown below
The relation is a function because for every height there is only one volume.
(c)
To Find: If V as a function of x , write the function and determine the domain.
(c)

Answer to Problem 75E
V=4x(12−x)2 , 0<x<12
Explanation of Solution
Given: An open box of maximum value is to be made from a square piece of material, 24 cm on a side, by cutting equal squares from the corners and turning up the sides.
V=l×w×hV=(24−2x)(24−2x)xV=x(24−2x2)V=4x(12−x2)
Thus the function is V=4x(12−x)2
And
Domain: 0<x<12
(c)
To Find: use the graphing utility to plot the points from the table in part (a) with the function from part (c). How closely does the function represent the data?
(c)

Answer to Problem 75E
The function is a good fit.
Explanation of Solution
Given: An open box of maximum value is to be made from a square piece of material, 24 cm on a side, by cutting equal squares from the corners and turning up the sides.
The graph from the table is
Function: V=4x(12−x)2
The function is good fit.
Chapter 1 Solutions
PRECALCULUS W/LIMITS:GRAPH.APPROACH(HS)
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