f(x)= 4x−4−12x 2 −4x+19​

It seems like you want to simplify the function f(x). Let's do it step by step:

f(x) = 4x - 4 - 12x^2 - 4x + 19

First, let's group the like terms together:

f(x) = -12x^2 + 4x - 4x - 4 + 19

Then, simplify the function:

f(x) = -12x^2 + 19

So, the simplified form of the function f(x) is f(x) = -12x^2 + 19.