11. If $a<-1$, then the point $M P\left(a^{2}-2 a-1, \frac{a+1}{|a+1|}\right)$ is in
(A) the first quadrant
(B) the second quadrant
(C) the third quadrant
(D) the fourth quadrant
Answer: (D)
Solution: When $a<0$, $y=\frac{a+1}{|a+1|}=-1<0$,
So point $M$ is in the fourth quadrant.
Therefore, choose (D).