Derivative of x²-4x

1. Differentiate $x^{2} - 4 x$ term by term:

   1. Apply the power rule: $x^{2}$ goes to $2 x$

   2. The derivative of a constant times a function is the constant times the derivative of the function.

      1. The derivative of a constant times a function is the constant times the derivative of the function.

         1. Apply the power rule: $x$ goes to $1$

         So, the result is: $4$

      So, the result is: $-4$

   The result is: $2 x - 4$

The answer is:

$$2 x - 4$$