Given the Function:

f (x) = - 2e^x find f (x), if x=3

So far what I manage to grasp with this equation is

replacing the "x" with 3 So: f (3) = - 2e^ (3)

The answer (using the scientific calculator) gave me - 6

I have no Idea what are the other steps to this equation.

Okay e^3 is 20.08553692 x - 2 = 4.017107385

maybe you had your calculator on the wrong mode or entered it wrong

F (x) = - 2e^x

x=3

f (3) = - 2e^3

pemdas so exponents first

e^3

e=2.718281828454590

cube that

20.0855

now we have

-2 times 20.0855=-40.1711

answer should be - 40.1711

(I see what you did wrong, if - 6=-2 times e^3, divide - 2, 3=e^3, maybe you just put - 2 times 3 by mistake)