Derivative of 2x^2+7x-9

1. Differentiate $2 x^{2} + 7 x - 9$ term by term:

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

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

      So, the result is: $4 x$

   2. 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: $7$

   3. The derivative of the constant $\left(-1\right) 9$ is zero.

   The result is: $4 x + 7$

The answer is:

$$4 x + 7$$