Determine all primitive functions

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Homework Help Overview

The problem involves finding all primitive functions (antiderivatives) for the function 2x(x^2+3)^4, which falls under the subject area of calculus, specifically integration techniques.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the initial attempts at expanding the function and express uncertainty about the correctness of their results. There is mention of needing to understand the question better and exploring substitution methods for integration.

Discussion Status

Some participants have suggested using substitution as a potential approach to simplify the integration process. There is an acknowledgment of the need for a constant of integration and a hint that a simple substitution could be effective. Multiple interpretations of the problem are being explored, but no consensus has been reached.

Contextual Notes

Participants note that the problem may have been misclassified initially and that it requires a specific integration technique rather than straightforward expansion. There is also a reminder to consider the highest degree term in the final answer.

beyondlight
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Homework Statement



Determine all primitive functions for the function:

2x(x^2+3)^4

2. The attempt at a solution

When i expanded i got the primitive to be:

2(x^9/9)+3x^8+18x^6+54x^4+81x^2But this was wrong. I am not sure I have understood the question. Help?
 
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beyondlight said:

Homework Statement



Determine all primitive functions for the function:

2x(x^2+3)^4

2. The attempt at a solution

When i expanded i got the primitive to be:

2(x^9/9)+3x^8+18x^6+54x^4+81x^2But this was wrong. I am not sure I have understood the question. Help?
I have moved this thread, as it is not a precalculus problem.

Apparently the problem asks you to find all antiderivatives of 2x(x2 + 3)4. In other words, carry out this integration: ##\int 2x(x^2 + 3)^4 dx##. The answer should have a highest degree term of x10. Don't forget the constant of integration.
Instead of expanding the binomial in parentheses, think about a simple substitution that you can do.
 
One possible substitution is 2x(z)^4

But I am not sure how to proceed from here...
 
beyondlight said:
One possible substitution is 2x(z)^4
If z = x^2 + 3, what is dz?
beyondlight said:
But I am not sure how to proceed from here...
A very simple substitution will work, and you're on the right track,
When you use substitution to evaluate an integral, you're using the chain rule in reverse.
 

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