# Math Help - Improper Integral

1. ## Improper Integral

1. Determine whether the improper integral converges or diverges.

2. Where are you stuck?

3. Well , I first let u=x-2, so du=dx. Also, when x=22, u=20, and when x=20,u=18.

In another question exactly the same just different numbers, i did my own procedure and it worked out, but for this one, im not sure if I have to split up the integral into two parts since last time the denominator of the integral u approached 0 (unbounded near u=0).

4. anyone know how to solve this?

5. Note that

$|x-21|=\left\{\begin{array}{cc}-(x-21),&\mbox{ if }
x\leq 21\\x-21, & \mbox{ if } x>21\end{array}\right.$

See where I'm goin here? You've gotta break it up.

6. yeah, i understand that, but im not sure what are the upper and lower bounds of the integral with a negative sign since x less than or equal to 21.

7. = $\lim_{x\to{21}^-}\int_{20}^{21}\frac{1}{\sqrt[3]{-(x-21)}}dx+\lim_{x\to21^+}\int_{21}^{22}\frac{1}{\sqr t[3]{x-21}}$

8. does it converge to 3? This is what i got as an answer.

9. Anyone?