Answer:
r+5 r^2+4r-21
-------------- / --------------------
r^2+5r-14 r-2
r+5 r-2
= -------------- x --------------------
r^2+5r-14 r^2+4r-21
r+5 r-2
= -------------- x --------------------
(r+7)(r-2) (r+7)(r-3)
r+5
= -----------------
(r+7)^2 (r-3)
hope it helps
Explanation: