## Calculus: Early Transcendentals (2nd Edition)

$\dfrac{d}{dx}(cx^n)=c\dfrac{d}{dx}(x^n)=cnx^{n-1}$
To derivate a function multiplied by a constant, you can multiply that constant by the derivate of the function: $\dfrac{d}{dx}(cx^n)=c\dfrac{d}{dx}(x^n)$