3х²+2х-1=5х+5
3х²-3х-6=0
х²-х-2=0
х₁= 1+√(1+8) =1+3 = 2
2 2
х₂= 1-√(1+8) =1-3 = -1
2 2
х²+4х-2х+8=32
х²+2х-24=0
х₁= -2+√(4+96) =-2+10 = 4
2 2
х₂= -2-√(4+96) =-2-10 =-6
2 2
2+х+2х²+4х+2х-8-х²=2х
х²+5х-6=0
х₁= -5+√(25+24) =-5+7 = 1
2 2
х₂= -5-√(25+24) =-5-7 = -6
2 2