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UkoKoshka [18]
3 years ago
14

Bare with me, fractions.

Mathematics
2 answers:
Anettt [7]3 years ago
6 0

\fbox{Option C} is correct as \dfrac{1}{3}\left( {3x} \right) is equal to x an it is equal to inverse x.

Further explanation:

A function that is a reverse of another function is known as an inverse function. If we substitute x in a function f and it gives a result of y then its inverse z to y gives the result x.

Given:

The function f\left( x \right) = 3x and g\left( x \right) = \dfrac{1}{3}x

We have to verify that g\left( x \right) is the inverse of f\left( x \right).

To verify that g\left( x \right) is the inverse of f\left( x \right) we have to show that \left( {f \circ g} \right)\left( x \right) = \left( {g \circ f} \right)\left( x \right).

First we have to find \left( {f \circ g} \right)\left( x \right).

\left( {f \circ g}\right)\left( x \right) can be obtained as,  

\left( {f\circ g} \right)\left( x \right) = f\left( {g\left( x \right)} \right).

Substitute \dfrac{1}{3}x for g\left( x \right) in above equation to obtain \left( {f \circ g} \right)\left( x \right).

\begin{gathered}\left( {f \circ g}\right)\left( x \right) = f\left( {\frac{1}{3}x} \right) \\= 3\left( {\frac{1}{3}x}\right)\\=x\end{gathered}

Now, we have to find \left( {g \circ f} \right)\left( x \right).

\left( {g \circ f} \right)\left( x \right) can be obtained as,  

\left( {g \circ f} \right)\left( x \right) = g\left( {f\left( x \right)} \right).

Substitute 3x for f\left(x\right) in above equation to obtain \left( {g \circ f} \right)\left( x \right).

\begin{gathered}\left( {g \circ f}\right)\left( x \right)= g\left( {3x} \right) \\=\frac{1}{3}\left( {3x}\right)\\=x \\ \end{gathered}

Here, \left( {g \circ f} \right)\left( x \right) is equal to x and \left( {f \circ g} \right)\left( x \right) is equal to x.

Option A is not correct as 3x\left( {\dfrac{x}{3}} \right) is equal to {x^2} which is not equal to inverse x.

Option B is not correct as \left( {\dfrac{1}{3}x} \right)\left( {3x} \right) is equal to {x^2} which is not equal to inverse x.

\fbox{Option C} is correct as \dfrac{1}{3}\left( {3x} \right) is equal to x an it is equal to inverse x.

Option D is not correct as \frac{1}{3}\left( {\frac{1}{3}x} \right) is equal to \frac{1}{9}x which is not equal to inverse x.

Learn more:

1. Learn more about functions brainly.com/question/2142762

2. Learn more about range of the functions brainly.com/question/3412497

3. Learn more about relation and function brainly.com/question/1691598

Answer details:

Grade: High school

Subject: Mathematics

Chapter: Functions

Keywords: functions, range, domain, inverse, reverse, fraction, relation, expression, \left( {g \circ f} \right)\left( x \right), \left( {f \circ g} \right)\left( x \right).

Andrew [12]3 years ago
4 0
If we want to verify that g ( x ) is the inverse of f ( x ) we have to show that:
( f ° g ) = ( g ° f )
f ( g ( x ) )=  3 · ( 1/3 x ) = x
g ( f ( x ) ) = 1/3 · ( 3 x ) = x
Answer:
C ) 1/3 ( 3 x )
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