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April 21, 2014

April 21, 2014

Posted by **Me** on Thursday, December 7, 2006 at 2:58pm.

how would I find the most general antiderivative of the function. I also have to check my answer by differentiation.

Would I have to find the derivative first? (I got 12x -8)

What are the steps to solving a problem like this?

No, don't do the derivative first. Do that on the integral, to check your answer.

I use the word "integral" for what you are calling "antiderivative". You can say I am old-fashioned, but I don't see a need for a longer word.

The general rule for integrating any

a x^n term

is that the integral is

a x^(n+1)/(n+1)

When you have a polynomial, as you do here, the integral is the sum of the integrals of the terms.

The first term of the integral is

6 x^3/3 = 2 x^3. Take the derivative of that and you get the original 6 x^2 back, so it is the right answer.

Now you do the other terms, and add them up.

Remember that the most general integral has an arbitrary constant term added.

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