# To evaluate f ( x ) = 3 x − 1 at a number, substitute the number for x in the definition of f ( x )

### Precalculus: Mathematics for Calcu...

6th Edition
Stewart + 5 others
Publisher: Cengage Learning
ISBN: 9780840068071

### Precalculus: Mathematics for Calcu...

6th Edition
Stewart + 5 others
Publisher: Cengage Learning
ISBN: 9780840068071

#### Solutions

Chapter 2.1, Problem 32E
To determine

## To evaluate f(x)=3x−1 at a number, substitute the number for x in the definition of f(x)

Expert Solution

The given function of the values f(2x)=6x1,2f(x)=6x2.

### Explanation of Solution

Given information:consider the function f(x)=3x1

Start by assume x is the variable of a function f(x) .

Evaluate the values of the function f(x)=3x1 for the given values of the variable x

Plug the value x=2x, in the function f(x)=3x1 then we get the value of f(2x).

f(2x)=3(2x)1f(2x)=6x1

2f(x)=2(3x1)         Substitute f(x)=3x12f(x)=6x2

Thus, f(2x)=6x1,2f(x)=6x2.

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