Function Inverses Answers

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Which expression is equivalent to (f + g)(4)?

A
f(4) + g(4)
B
f(x) + g(4)
C
f(4 + g(4))
D
4(f(x) + g(x))
3

The graphs of f(x) and g(x) are shown below. Which of the following is the graph of (g – f)(x)?

Question illustration
A
On a coordinate plane, a straight line with a negative slope goes through points (negative 2, 6), (0, 0), and (2, negative 6)
Option A
B
On a coordinate plane, a straight line with a negative slope goes through points (negative 6, 6), (0, 0), and (6, negative 6).
Option B
C
On a coordinate plane, a straight line with a positive slope goes through points (negative 2, negative 6), (0, 0), and (2, 6).
Option C
D
On a coordinate plane, a straight line with a positive slope goes through points (negative 6, negative 6), (0, 0), and (6, 6).
Option D
4

The graphs of f(x) and g(x) are shown below. For what interval is the value of (f – g)(x) negative?

Question illustration
A
(negative infinity, negative 1)
Option A
B
(negative infinity, 2)
Option B
C
(0, 3)
Option C
D
(2, infinity)
Option D
5

If f(x) and g(x) are quadratic functions but (f + g)(x) produces the graph below, which statement must be true?

Question illustration
A
The leading coefficients of f(x) and g(x) are opposites.
B
The leading coefficients of f(x) and g(x) are opposite reciprocals.
C
The leading coefficients of f(x) and g(x) are the same.
D
The leading coefficients of f(x) and g(x) are reciprocals.
6

If and d(x) = x + 3, what is the domain of (cd)(x)?

Question illustration
A
all real values of x
B
all real values of x except x = 2
C
all real values of x except x = –3
D
all real values of x except x = 2 and x = –3
9

Which expression is equivalent to (st)(6)?

A
s(t(6))
B
s(x) × t(6)
C
s(6) × t(6)
D
6 × s(x) × t(x)

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