integral abs values

For all real b, the integral from 0 to b of the abs(2X) dx is

A) -b *abs(b)
B) b^2
C) -b^2
D) b*abs(b)
E)none of the above

Quote:

---

Originally Posted by sandiego234

For all real b, the integral from 0 to b of the abs(2X) dx is

A) -b *abs(b)
B) b^2
C) -b^2
D) b*abs(b)
E)none of the above

---

Page three I think

http://www.mathhelpforum.com/math-he...-tutorial.html

Hello,

Remember : if x<0, |x|=-x and if x>0, |x|=x.


If b>0 :

since x is in [0,b], positive values.




Now, if b<0 :

since x is in [b,0], negative values.





So it's none of these...