Substitute -4 for x in the original equation.

f(x) = 5x 1

f(-4) = 5(-4) 1

f(-4) = -20 1

f(-4) = -19

f(x)=5x 1 find f(-4)

So you replace or substitute x with -4:

f(-4)=5(-4) 1

5x-4= -20, then 1= -19

Hope this helped

Source(s): Maths student

Source(s): Maths student

Source(s): Maths student

Substitute -4 into the equation.

This post is last updated on hrtanswers.com at Date : 1st of September – 2022