## Calculus 10th Edition

The derivative is $6x^2+12x$.
Whenever two or more functions are being added or subtracted, the overall derivative would be the sum of the derivatives of every smaller function. The derivative of $2x^3$ is $6x^2$, the derivative of $6x^2$ is $12x$ and finally the derivative of $-1$ is $0$; hence the overall derivative $6x^2+12x$