Question

What is the value of f(-3) for the function?
f(x)=4x-9

Answer 1

-21

Explanation:

what is the value of f(-3) for the function?

f(x)=4x-9

f (-3) = 4 · (-3) - 9 = - 12 - 9 = - 21

Answer 2

-21, f(-3) = -21

Explanation:

here's a trick when answering question like these:

you know that the equation starts with f(x), but in the question it gives you f(-3). So, you can see that the x = -3 because the x is replaced by the -3.

f(x) = 4x - 9

f(-3) = 4(-3) - 9

f(-3) = -12 - 9

f(-3) = -21