What is the value of the function f(x) = 2x + 4 at x = -1?

To find the value of the function ( f(x) = 2x + 4 ) at ( x = -1 ), substitute ( -1 ) for ( x ) in the equation.

Here’s how it works step by step:

1. Begin with the function: ( f(x) = 2x + 4 ).

2. Substitute ( -1 ) into the function:

[

f(-1) = 2(-1) + 4

]

3. Carry out the multiplication:

[

f(-1) = -2 + 4

]

4. Finally, perform the addition:

[

f(-1) = 2

]

Thus, the value of the function ( f(x) = 2x + 4 ) at ( x = -1 ) is ( 2 ). This calculation shows how substitution and arithmetic within the function yield the correct output.