?

AP® Calculus AB-BC

Free Version

Upgrade subject to access all content

Moderate

Chain Rule with Explicit u

APCALC-MNKSF9

If $y=x^3-2$ and $u=3x+1$, then: $\cfrac{dy}{du}=$

A

$9x^2$

B

$\cfrac{9x^3+6}{(3x+1)^2}$

C

$x^2$

D

$12x^3+3x^2-6$