Posted by **Ann** on Monday, October 7, 2013 at 1:56am.

For the function

f(x)=3x^3−42x

Compute the difference quotient

[f(x+h)−f(x)]/h,h≠0

I checked my work like 3 times and still got [(-2x^3)+(3hx^2)+(3xh^2)+(h^3)-(42h)]/h

Is it wrong?

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