Hey guys. I'm trying to teach my self Calculus using the internet and I've got to the point were I need to learn what Integration is. One obstacle along my way is this equation:(adsbygoogle = window.adsbygoogle || []).push({});

[itex]\int_{a}^{b}[/itex]f(x)dx=[itex]\sum_{i=0}^{n-1}[/itex]f(xi)[itex]\Delta[/itex]x

What is the value of d? And what is the use of integration in Mathematics?

NOTE: If you reply with "Just buy a book.", respond I will not.

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# What is this formula in Calculus?

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