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AP® Calculus AB-BC

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Moderate

Horizontal Tangent Line, Exponential

APCALC-BXCEOB

If $f( x ) ={ e }^{ 3x }( 3x-4 ) $, find any $x$ values where a horizontal tangent line exists.

A

At $x=0$.

B

At $x=1$.

C

At $x=0$ and $x=1$.

D

At $x=0$ and $x=4/3$.