Question

Find each function value

1. f(7) if (x)=5x

2. f(4) if f(x)=3x-1

Answer 1

`1. \: \: f(7) = 35`

`2. \: f(4) = 11`

Step-by-step explanation

To find the value of a function, f(x) at a given value x=a, we plug in x=a into f(x) to obtain f(a) in simplified form.

The first function is

`f(x) = 5x`

To find f(7), we substitute x=7, into the function.

`\implies f(7) =5(7) = 5 * 7 = 35`

The second function is

`f(x) = 3x - 1`

To find f(4), we replace x with 4 to obtain,

`f(4) = 3(4) - 1`

`f(4) = 12 - 1 = 11`