How can you find f (3) if f (x) = - 2x2 - 4?

Answer: f (3) = -20

Step-by-step explanation:

If you look at f (x) and f (3), you can see that 3 is in place of x. That means when x=3, what is f (x). You plug in x=3 into f (x) and solve.

f (3) = -2 (3) ²-2

f (3) = -2 (9) - 2

f (3) = -18-2

f (3) = -20