The derivative of the function $$f(x)=-3x^2+6x-4$$​ is given by:

Correct option is D

​$$\begin{aligned}&\text{Differentiate term by term:} \\&f'(x) = \frac{d}{dx}(-3x^2) + \frac{d}{dx}(6x) + \frac{d}{dx}(-4) \\&f'(x) = -3 \cdot 2x^1 + 6 \cdot 1 - 0 \\&f'(x) = -6x + 6\end{aligned}$$​​