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Example Questions
Example Question #1 : Miscellaneous Functions
Define a function .
Which statement correctly gives ?
The inverse function of a function
can be found as follows:
Replace with
:
Switch the positions of and
:
or
Solve for . This can be done as follows:
Square both sides:
Add 9 to both sides:
Multiply both sides by , distributing on the right:
Replace with
:
Example Question #1 : Miscellaneous Functions
Refer to the above diagram, which shows the graph of a function .
True or false: .
True
False
False
The statement is false. Look for the point on the graph of with
-coordinate
by going right
unit, then moving up and noting the
-value, as follows:
, so the statement is false.
Example Question #2 : Miscellaneous Functions
The above diagram shows the graph of function on the coordinate axes. True or false: The
-intercept of the graph is
False
True
False
The -intercept of the graph of a function is the point at which it intersects the
-axis (the vertical axis). That point is marked on the diagram below:
The point is about one and three-fourths units above the origin, making the coordinates of the -intercept
.
Example Question #3 : Miscellaneous Functions
A function is defined on the domain
according to the above table.
Define a function . Which of the following values is not in the range of the function
?
This is the composition of two functions. By definition, . To find the range of
, we need to find the values of this function for each value in the domain of
. Since
, this is equivalent to evaluating
for each value in the range of
, as follows:
Range value: 3
Range value: 5
Range value: 8
Range value: 13
Range value: 21
The range of on the set of range values of
- and consequently, the range of
- is the set
. Of the five choices, only 45 does not appear in this set; this is the correct choice.
Example Question #173 : College Algebra
Evaluate:
Evaluate the expression for
, then add the four numbers:
Example Question #4 : Miscellaneous Functions
Evaluate:
Evaluate the expression for
, then add the five numbers:
Example Question #175 : College Algebra
refers to the floor of
, the greatest integer less than or equal to
.
refers to the ceiling of
, the least integer greater than or equal to
.
Define and
Which of the following is equal to ?
, so, first, evaluate
by substitution:
, so evaluate
by substitution.
,
the correct response.
Example Question #176 : College Algebra
refers to the floor of
, the greatest integer less than or equal to
.
refers to the ceiling of
, the least integer greater than or equal to
.
Define and
.
Evaluate
, so first, evaluate
using substitution:
, so evaluate
using substitution:
,
the correct response.
Example Question #177 : College Algebra
Consider the polynomial
,
where is a real constant. For
to be a zero of this polynomial, what must
be?
None of the other choices gives the correct response.
By the Factor Theorem, is a zero of a polynomial
if and only if
. Here,
, so evaluate the polynomial, in terms of
, for
by substituting 2 for
:
Set this equal to 0:
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