Suppose that $f(x) = 4 x^2 - 5 x$. Find:

(A) $f'(x)$ =

(B) The slope of the graph of $f(x)$ at $x = 2$ and $x = 3$.
Slope at x = 2:
Slope at x = 3:

(C) An equation for the tangent lines at $x = 2$ and $x = 3$.
Tangent line at x = 2: $y =$
Tangent line at x = 3: $y =$

(D) List all values of $x$ where the tangent line is horizontal.
Value(s) of $x$ =