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

ANSWER

$f( - 5)=23$

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,

$f( - 5)=23$