数学题求不等式的解集,-x2+4x+5

1.
-x^2+4x+5＜0
x^2-4x-5＞0
(x-5)(x+1)＞0
x＞5或x＜-1
2.
Y=√[(x-1)/(x+2)]+5
x+2≠0且(x-1)/(x+2)≥0
x≠-2且x≥1或x＜-2
x≥1或x＜-2