(a)
Find what the given expression represents
(a)

Answer to Problem 100E
The expression x2(x−3) represents the volume of water.
Explanation of Solution
Given:
The figure shows a glass cube partially filled with water.
The given expression is x2(x−3)
Consider the following expression:
x2(x−3)
A glass cube of side x feet, height of a glass cube filled with water is (x−3), and area of a base of a glass cube is x2 .
Therefore, above expression represents a product of base area x2 and height (x−3)
Because volume of a cube is,
length × breadth × height
Here length of a cube is x feet, breadth of a cube is x feet and height of a glass cube filled with water is (x−3) feet
Above can be written as follows:
x2(x−3)=x×x×(x−3)
Hence, expression x2(x−3) represents the volume of water.
(b)
Find the capacity of the cube.
(b)

Answer to Problem 100E
The capacity of cube is 512ft3
Explanation of Solution
Given:
The figure shows a glass cube partially filled with water.
The given expression is x2(x−3)=320
Consider the following equation:
x2(x−3)=320
To find capacity of the cube, factorize the above expression for the value of x
Above equation is factorable, factorize the equation by appropriate method.
Distribute x2 over the equation x2(x−3)=320
x3−3x2=320
Subtract 320 from both sides:
x3−3x2−320=320−320
Combine like terms to simplify the expression:
x3−3x2−320=0.......(1)
Put x=8 in the above expression.
x3−3x2−320=083−3×82−320=0512−192−320=00=0
Therefore x=8 is a zero of equation (1)
Hence above equation (1) can be written as follows:
(x−8)(x2+5x+40)=0........(2)
Further solve the equation (2) (x−8)(x2+5x+40)=0 by zero product rules
Set factor (x−8) equal to zero:
x−8=0
Simplify this expression for the value of x
x=8
Further put another factor x2+5x+40=0
Use quadratic formula to solve the above quadratic expression
x=−5±√52−1602=−5±√25−1602=−5±√−1352
This gives no real roots.
Hence the side length of cube is x=8ft
The volume of cube is product of base area and its height.
Since the base is square,
Area of base is x2 and height is x
Therefore, the volume is x2⋅x=x3
For x=8 the volume is given by
(8)3=512
Hence, the capacity of cube is 512ft3
Chapter A Solutions
EBK PRECALCULUS W/LIMITS
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