х(х+5)<0

____-5____0___>

........////////.......

(-5, 0)

(х-4)(х+4)>0

_____-4_____4____>

///////............////////

(-беск, - 4),(4, +беск)

_____-5_____3_____>

\\\\\\\...........\\\\\\\

(-беск, - 5), (3, +беск)

х²-3х-4<=0

(х-4)(х+1)<=0

_____-1_____4____>

..........//////////.........

[-1, 4]