Question

Find f(-5)

f(x) = -4x + 3

Answer 1

For this case we have a function of the form
`y = f (x)`

Where:

`f (x) = - 4x + 3`

We must find the value of the function when the variable x is -5.

Then, substituting,
`x = -5`

`f (-5) = - 4 (-5) +3`

We have that by sign law
`- * - = +`

`f (-5) = 20 + 3\\f (-5) = 23`

Answer:

`f (-5) = 23`

Answer 2

`f( - 5)=23`

Step-by-step explanation

The given function is

`f(x)=-4x+3`

To find f(-5), we substitute x=-5 to obtain;

`f( - 5)=-4( - 5)+3`

We multiply out to obtain:

`f( - 5)=20+3`

We simplify to get,

`f( - 5)=23`