# Definate integrals (the first way- by definition)

• Dec 31st 2011, 05:09 AM
mathk
Definate integrals (the first way- by definition)
∫[0,2,2-x^2,]
• Dec 31st 2011, 05:28 AM
ILikeSerena
Re: Definate integrals (the first way- by definition)
Quote:

Originally Posted by mathk
∫[0,2,2-x^2,]

Welcome to MHF, mathk! :)

Do you mean $\displaystyle \int_0^2 (2-x^2) dx$?

If so, could you perhaps show a little of what you know?
That makes it easier for us to help you.
• Dec 31st 2011, 05:48 AM
mathk
Re: Definate integrals (the first way- by definition)
2-0/n= 2/n

x1 = 2/n
x2=4/n
xi-2i/n

\int_0^2f(2i/n)2/n
how do you draw or write limit and summation?
• Dec 31st 2011, 05:58 AM
ILikeSerena
Re: Definate integrals (the first way- by definition)
Use [ tex ] ... [ /tex ] around your formulas to display them mathematically (without the spaces before and after "tex").

To get a summation, write [ tex ]\sum_{i=0}^{\infty} x_i[ /tex ], which shows up like:

$\displaystyle \sum_{i=0}^{\infty} x_i$

To get a limit, write [ tex ]\lim_{n \to \infty} x_i[ /tex ], which shows up like:

$\displaystyle \lim_{n \to \infty} x_i$

Click Reply With Quote to see what I did.