Problem with an integral

1. Jul 27, 2008

Manzanita

Yesterday in class a professor give us this problem:

X= integral of 3du

This is my first year in the university, and I don't know anything about integrals, I have tried to solve it, but I can not find the result... the correct result. It was like a "brain shock" for me, because the professor doesn't explain nothing, just give us that.
Also, I don't know english, and I don't know if somebody could help me.

Thank you anyway...

2. Jul 27, 2008

konthelion

The problem is $$x= \int{3du}$$. So, how would you integrate a constant?

This might help if I change the variables to x, y which you're probably more accustomed to seeing. $$y= \int{3dx}$$

3. Jul 27, 2008

vdfortd

An integral is like asking you for an anti-derivative. So that question is basically asking you the antiderivative of 3 with respect to x, which is _____________?

4. Jul 27, 2008

tiny-tim

Welcome to PF!

Hi Manzanita! Welcome to PF!

In case you don't understand "anti-derivative", that means that you are looking for a function y(x) such that dy/dx = 3.

5. Jul 27, 2008

Manzanita

Wow!!!!

Thank you :D

I was really [I don't know how to explain it...] "problemous... problematic?" [sorry my english is not very well indeed...]

I have seen the answers and I have understand [reading my book and this topic].

Thank you very much ^^

PD: Muchas gracias de veras :D!!!!