Question

(х-7)(х+4)<0
(х*-25)(х-2)(х-4)`>0

Answer 1

1)х^2+4х-7х-28 <0
х^2-3х-28 <0
Д=9+112=121
х=3-11/2=8/2=4
х=3+11/2=14/2=7

2) (х*-25)(х-2)(х-4)`>0
(х-25)>0
х>25
(х-2)>0
х>2
х-4>0
х>4