Question

Evaluate for f(-2). Show your work.

f(x) = -5x + 4 I don't want to know the answer I just want to know how to do it. Anyone help?

Answer 1

Gotta learn that function notation!! :)
\[\Large\rm f(\color{orangered}{x})=-5(\color{orangered}{x})+4\]See how I colored the x's the same color?
They change at the same time.
So if we want to evaluate this function at x=-2,\[\Large\rm f(\color{orangered}{-2})=-5(\color{orangered}{-2})+4\]We replace all of our x's with -2.
They both change at the same time.

Answer 2

Do you understand how to simplify down the right side?

Answer 3

Alright, I understand. Thanks!