Math Is Fun Forum

baggins

Member

Registered: 2008-06-24

Posts: 5

evaluate definite integral

Hi everyone,

I have to evaluate  a definite integral but I'm stuck to finish it

Here is the question and my answer:

(b)          Evaluate      ∫3 on the top and 1 on the bottom( i don't how to write on the keyboard)  follow by x(7x²+5)dx
     
     = [7x³+5] 3 at the top and 1 at the bottom

     = (7x³+5)³ - (7x3+5)^1   

I hope someone understand this, I don't know how to write the limits of integration with my keyboard.:

Thanks:)

luca-deltodesco

Member

Registered: 2006-05-05

Posts: 1,470

Re: evaluate definite integral

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The Beginning Of All Things To End.
The End Of All Things To Come.

baggins

Member

Registered: 2008-06-24

Posts: 5

Re: evaluate definite integral

Hi luca-deltodesco,

Thanks for your help, how did you write it like this, is there a link on the website on how to use symbols?:)

luca-deltodesco

Member

Registered: 2006-05-05

Posts: 1,470

Re: evaluate definite integral

http://mathisfunforum.com/viewtopic.php?id=4397

you can also click on any image generated via LaTeX on this forum to see the code that generated it, so if you click on my maths you'll get for example in the top line.

\int_1^3 x(7x^2+5)\ dx = \int_1^3 7x^3 + 5x\ dx = \left[\frac{7}{4}x^4+\frac{5}{2}x^2\right]_1^3

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The Beginning Of All Things To End.
The End Of All Things To Come.

baggins

Member

Registered: 2008-06-24

Posts: 5

Re: evaluate definite integral

Thanks again luca-deltodesco:)