Asked by Arshana Arumansan on May 15, 2024
Verified
Which statement(s) verify that f(x) =4x+1f ( x ) = \frac { 4 } { x + 1 }f(x) =x+14 and g(x) =4−xxg ( x ) = \frac { 4 - x } { x }g(x) =x4−x are inverse?
A) f(x) +g(x) =4x+1+4−xx=0f ( x ) + g ( x ) = \frac { 4 } { x + 1 } + \frac { 4 - x } { x } = 0f(x) +g(x) =x+14+x4−x=0
B) f(x) g(x) =4x+14−xx=1\frac { f ( x ) } { g ( x ) } = \frac { \frac { 4 } { x + 1 } } { \frac { 4 - x } { x } } = 1g(x) f(x) =x4−xx+14=1
C) f(g(x) ) =44−xx+1=x,g(f(x) ) =4−4x+14x+1=xf ( g ( x ) ) = \frac { 4 } { \frac { 4 - x } { x } + 1 } = x , g ( f ( x ) ) = \frac { 4 - \frac { 4 } { x + 1 } } { \frac { 4 } { x + 1 } } = xf(g(x) ) =x4−x+14=x,g(f(x) ) =x+144−x+14=x
D) f(x) +g(x) =4x+1+4−xx=1f ( x ) + g ( x ) = \frac { 4 } { x + 1 } + \frac { 4 - x } { x } = 1f(x) +g(x) =x+14+x4−x=1
E) f(g(x) ) =44−xx+1=1;g(f(x) ) =4x+14x+1=1f ( g ( x ) ) = \frac { 4 } { \frac { 4 - x } { x } + 1 } = 1 ; g ( f ( x ) ) = \frac { \frac { 4 } { x + 1 } } { \frac { 4 } { x + 1 } } = 1f(g(x) ) =x4−x+14=1;g(f(x) ) =x+14x+14=1
Inverse Function
A function that reverses the operation of a given function, swapping the roles of its inputs and outputs.
- Identify and verify inverse relationships between functions.
Verified Answer
LK
Leslie KalckMay 22, 2024
Final Answer :
C
Explanation :
Choice A cannot be correct because the sum of the functions is not equal to 0. Choice B cannot be correct because the quotient of the functions is not always equal to 1. Choice D cannot be correct because the sum of the functions is not equal to 1. Choice E cannot be correct because while it correctly shows that both compositions of the functions result in 1, it is not necessary to show both of these compositions to verify that the functions are inverses. Only choice C correctly shows that the composition of the functions equals the input value, which is the definition of inverse functions.
Learning Objectives
- Identify and verify inverse relationships between functions.