f(x)=3x^4-4x^3. where f is increasing? decreasing?concave up? concave down? infliction points?

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Given `f(x)=3x^4-4x^3` :

Note that a function is increasing if the first derivative is positive and decreasing where the first derivative is negative. All extrema occur only at critical points (the first derivative is zero or fails to exist.)

The function is concave up when the second derivative is positive, concave down when the second derivative is...

(The entire section contains 194 words.)

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