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 5.4, Problem 5E

a.

To determine

Find the y coordinate of a point P of a rectangle inscribed in an isosceles right triangle.

a.

Expert Solution
Check Mark

Answer to Problem 5E

The y coordinate of point P is x+1

Explanation of Solution

Calculation:

Given the hypotenuse of an isosceles triangle is 2 units longer

The numbers are x and y   0<x<20

  x+y=20y=20x

The equation of straight line AB is y=x+1

Thus, the y coordinate of point P is x+1

b.

To determine

Express the area of the rectangle in learns of x .

b.

Expert Solution
Check Mark

Answer to Problem 5E

Area of the rectangle is 2x2+2x

Explanation of Solution

Calculation:

Given the hypotenuse of an isosceles triangle is 2 units longer

The numbers are x and y   0<x<20

  x+y=20y=20x

Area of the rectangle

  A(x)=2x(x+1)        =2x2+2x

Thus, Area of the rectangle is 2x2+2x

c.

To determine

Find the largest area of the area rectangle in learns of x .

c.

Expert Solution
Check Mark

Answer to Problem 5E

The maximum area of the rectangle is (12)

Explanation of Solution

Calculation:

Given the hypotenuse of an isosceles triangle is 2 units longer

The numbers are x and y   0<x<20

  x+y=20y=20x

Area of the rectangle

  A=2x2+2xdAdx=4x+2

For any function f(x) the condition of minimum and maximum is obtained by find f(x)=0 ,

Critical points and end points

Critical points occur at

         A=04+2=0       x=24        =12

solve it graphically, it has critical point occur at x=12

here dAdx>0 for 0< x<12anddAdx<0 for12x<1 this corresponds to maximum area.

For

  x=12 y=2x=1 A =2x2+2x   =(2)(12)2+2 (12)      =(12)

Graphical support:

  Calculus 2012 Student Edition (by Finney/Demana/Waits/Kennedy), Chapter 5.4, Problem 5E

Thus, the maximum area of the rectangle is (12)

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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Prob. 31ECh. 5.5 - Prob. 32ECh. 5.5 - Prob. 33ECh. 5.5 - Prob. 34ECh. 5.5 - Prob. 35ECh. 5.5 - Prob. 36ECh. 5.5 - Prob. 37ECh. 5.5 - Prob. 38ECh. 5.5 - Prob. 39ECh. 5.5 - Prob. 40ECh. 5.5 - Prob. 41ECh. 5.5 - Prob. 42ECh. 5.5 - Prob. 43ECh. 5.5 - Prob. 44ECh. 5.5 - Prob. 45ECh. 5.5 - Prob. 46ECh. 5.5 - Prob. 47ECh. 5.5 - Prob. 48ECh. 5.5 - Prob. 49ECh. 5.5 - Prob. 50ECh. 5.5 - Prob. 51ECh. 5.5 - Prob. 52ECh. 5.5 - Prob. 53ECh. 5.5 - Prob. 54ECh. 5.5 - Prob. 55ECh. 5.5 - Prob. 56ECh. 5.5 - Prob. 57ECh. 5.5 - Prob. 58ECh. 5.5 - Prob. 59ECh. 5.5 - Prob. 60ECh. 5.5 - Prob. 61ECh. 5.5 - Prob. 62ECh. 5.5 - Prob. 63ECh. 5.5 - Prob. 64ECh. 5.5 - Prob. 65ECh. 5.5 - Prob. 66ECh. 5.5 - Prob. 67ECh. 5.5 - Prob. 68ECh. 5.5 - Prob. 69ECh. 5.5 - Prob. 70ECh. 5.5 - Prob. 71ECh. 5.5 - Prob. 72ECh. 5.6 - Prob. 1QRCh. 5.6 - Prob. 2QRCh. 5.6 - Prob. 3QRCh. 5.6 - Prob. 4QRCh. 5.6 - Prob. 5QRCh. 5.6 - Prob. 6QRCh. 5.6 - Prob. 7QRCh. 5.6 - Prob. 8QRCh. 5.6 - Prob. 9QRCh. 5.6 - Prob. 10QRCh. 5.6 - Prob. 1ECh. 5.6 - 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