nikenike12345 36х + 3х^2= -33 
36х= -33-3х^2
36 = -33-3х
69 = - 3х
х=-21

лёля1711 3x²+36x+33=0/:3
x²+12x+11=0
D=144-44=100
x1=(-12+10):2
x1=-1
x2=(-12-10):2
x2=-11