Kak reshit uravnenie i kak raskrit skobki esli (x-1)(x+2)=28
Х^2+2х-х-2=28 х^2+х=28+2 х^2+х=30 х^2+х-30=0 D=1+120=121=11 х=-1-11/2=-6 х=-1+11/2=5