Evaluate the integral using the integration limits

In summary, the student attempted to solve the integral ∫x3/√(x2+9) using integration by parts and u-substitution, but was unsuccessful. They mentioned that their teacher had used a method involving substituting an "x" and asked for assistance. Another user recommended trying integration by parts again and using ehild's substitution, which would provide a quick solution.
  • #1
AryRezvani
67
0

Homework Statement



(Between 0-3) ∫x3/√(x2+9)

The Attempt at a Solution



I attempted U sub, but that didn't work. Neither did integration by parts; however, I do remember my teacher using a method involving sub'ing an "x" or something.

Anybody?

Will edit in attempts as I search YouTube for tutorials.
 
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  • #2
Are you sure that integration by parts doesn't work? I'll recommend that you try again, and perhaps show your work.
 
  • #3
Or substitute y=x^+9.

ehild
 
  • #4
AryRezvani said:

Homework Statement



(Between 0-3) ∫x3/√(x2+9)


The Attempt at a Solution



I attempted U sub, but that didn't work. Neither did integration by parts; however, I do remember my teacher using a method involving sub'ing an "x" or something.

Anybody?

Will edit in attempts as I search YouTube for tutorials.

Both methods work well here. For IP, use the exact same initial step like in the problem I took you through. ehild's sub also works very well, and quickly gives you an answer.
 

FAQ: Evaluate the integral using the integration limits

What is an integral?

An integral is a mathematical concept used to find the area under a curve. It is a fundamental concept in calculus that is used to solve a variety of problems in mathematics and science.

What are integration limits?

Integration limits are the upper and lower boundaries within which the integral is evaluated. They define the range over which the function is integrated and determine the size of the area under the curve.

How do you evaluate an integral using the integration limits?

To evaluate an integral using integration limits, you first need to identify the function to be integrated and the upper and lower limits. Then, you can use various techniques such as the fundamental theorem of calculus, substitution, or integration by parts to solve the integral and find the area under the curve.

What is the importance of integration limits?

Integration limits are crucial in determining the size of the area under a curve. They also help in solving various real-world problems by providing a specific range over which the integral is evaluated.

Can integration limits be negative or infinite?

Yes, integration limits can be negative or infinite, depending on the problem. In some cases, the integration limits may extend to negative infinity or positive infinity, while in others, they may be negative or positive finite values. It all depends on the function being integrated and the problem at hand.

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