Calculus 2012 Student Edition (by Finney/Demana/Waits/Kennedy)
Calculus 2012 Student Edition (by Finney/Demana/Waits/Kennedy)
4th Edition
ISBN: 9780133178579
Author: Ross L. Finney
Publisher: PEARSON
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Chapter 5, Problem 51RE

a.

To determine

To write a formula V(x) for the volume of box.

a.

Expert Solution
Check Mark

Answer to Problem 51RE

The required formula is V(x)=2x325x2+75x .

Explanation of Solution

Given information: A piece of cardboard measures 10 in. by 15 in. Two equal sides are removed from the corners of a 15 in. sides.

  Calculus 2012 Student Edition (by Finney/Demana/Waits/Kennedy), Chapter 5, Problem 51RE , additional homework tip  1

Calculation: The required formula is obtained as,

Refer to the diagram exercise 18 of the sction 4.4, but imagine the vertical side as 15” and the horizontal side as 10” .

The length of box be 152x .

The width of box be 102x2=5x .

The height of box be x .

  V(x)=x(152x)(5x)        =2x325x2+75x

Hence, the required formula is V(x)=2x325x2+75x .

b.

To determine

To find the domain of V for the problem situation and graph V over this domain.

b.

Expert Solution
Check Mark

Answer to Problem 51RE

The domain is: 0 < x< 5 and graph below,

  Calculus 2012 Student Edition (by Finney/Demana/Waits/Kennedy), Chapter 5, Problem 51RE , additional homework tip  2

Explanation of Solution

Given information: A piece of cardboard measures 10 in. by 15 in. Two equal sides are removed from the corners of a 15 in. sides.

  Calculus 2012 Student Edition (by Finney/Demana/Waits/Kennedy), Chapter 5, Problem 51RE , additional homework tip  3

Calculation: The required solution is obtained as,

  x must be > 0 since you have to cut something. x must be less than the smaller of 15/2 = 7.5 and 10/2 = 5, so that you don’t cut away more material than you actually have.

Hence, the domain is: 0 < x< 5 and graph below,

  Calculus 2012 Student Edition (by Finney/Demana/Waits/Kennedy), Chapter 5, Problem 51RE , additional homework tip  4

c.

To determine

To find the maximum volume and the value of x that gives it, by using a graphical method.

c.

Expert Solution
Check Mark

Answer to Problem 51RE

The maximum is at approximately x=1.96 and V=66.02 .

Explanation of Solution

Given information: A piece of cardboard measures 10 in. by 15 in. Two equal sides are removed from the corners of a 15 in. sides.

  Calculus 2012 Student Edition (by Finney/Demana/Waits/Kennedy), Chapter 5, Problem 51RE , additional homework tip  5

Calculation: The required solution is obtained as,

From the graph, the maximum is at approximately x=1.96 and V=66.02 .

d.

To determine

To confirm your result in part (C) analytically.

d.

Expert Solution
Check Mark

Answer to Problem 51RE

The required solution is 1.96.

Explanation of Solution

Given information: A piece of cardboard measures 10 in. by 15 in. Two equal sides are removed from the corners of a 15 in. sides.

  Calculus 2012 Student Edition (by Finney/Demana/Waits/Kennedy), Chapter 5, Problem 51RE , additional homework tip  6

Calculation: The required solution is obtained as,

Find V’ and where it is = 0.

  V'(x)=6x250x+75       0=6x250x+75       x=b±b24ac2a        =(50)±(50)24(6)(75)2(6)        =50±70012        =50±10712        =25±576        =25+5766.37        =255761.96

Hence the required solution is 1.96.

Chapter 5 Solutions

Calculus 2012 Student Edition (by Finney/Demana/Waits/Kennedy)

Ch. 5.1 - Prob. 11QRCh. 5.1 - Prob. 12QRCh. 5.1 - Prob. 1ECh. 5.1 - Prob. 2ECh. 5.1 - Prob. 3ECh. 5.1 - Prob. 4ECh. 5.1 - Prob. 5ECh. 5.1 - Prob. 6ECh. 5.1 - Prob. 7ECh. 5.1 - Prob. 8ECh. 5.1 - Prob. 9ECh. 5.1 - Prob. 10ECh. 5.1 - Prob. 11ECh. 5.1 - Prob. 12ECh. 5.1 - Prob. 13ECh. 5.1 - Prob. 14ECh. 5.1 - Prob. 15ECh. 5.1 - Prob. 16ECh. 5.1 - Prob. 17ECh. 5.1 - Prob. 18ECh. 5.1 - Prob. 19ECh. 5.1 - Prob. 20ECh. 5.1 - Prob. 21ECh. 5.1 - Prob. 22ECh. 5.1 - Prob. 23ECh. 5.1 - Prob. 24ECh. 5.1 - Prob. 25ECh. 5.1 - Prob. 26ECh. 5.1 - Prob. 27ECh. 5.1 - Prob. 28ECh. 5.1 - Prob. 29ECh. 5.1 - Prob. 30ECh. 5.1 - Prob. 31ECh. 5.1 - Prob. 32ECh. 5.1 - Prob. 33ECh. 5.1 - Prob. 34ECh. 5.1 - Prob. 35ECh. 5.1 - Prob. 36ECh. 5.1 - Prob. 37ECh. 5.1 - Prob. 38ECh. 5.1 - Prob. 39ECh. 5.1 - Prob. 40ECh. 5.1 - Prob. 41ECh. 5.1 - Prob. 42ECh. 5.1 - Prob. 43ECh. 5.1 - Prob. 44ECh. 5.1 - Prob. 45ECh. 5.1 - Prob. 46ECh. 5.1 - Prob. 47ECh. 5.1 - Prob. 48ECh. 5.1 - Prob. 49ECh. 5.1 - Prob. 50ECh. 5.1 - Prob. 51ECh. 5.1 - 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