3х^3-48х=0
3х(х^2-4^2)=0
3х•(х-4)•(х+4)
3х=0, х-4=0, х+4=0
х=0, х=4, х =-4
25х+10х^2+х^3=0
х(5^2+2•5•х+х^2)
х(х+5)^2=0
х=0,
х+5=0
х=-5
