1) x²-6x+8=0x²-6x=-8x²-6x+9=-8+9(x-3)²=1x-3=1 x-3=-1x₁=4 x₂=24*2=84+3=62) x²+2x-3=0x²+2x=3x²+2x+1=3+1(x+1)²=4x+1=2 x+1=-2x₁=1 x₂=-31*(-3)=-31+(-3)= 1-3=-23) x²-5x+6=0x²-5x=-6x²-5x+6,25=-6+6,25(x-2,5)²=0,25x-2,5=0,25 x-2,5=-0,25x₁=2,75 x₂=2,252,75*2,25=6,18752,75+2,25=54) x²-6x+5=0x²-6x=-5x²-6x+9=-5+9(x-3)²=4x-3=2 x-3=-2x₁=5 x₂= 15*1=55+1=65) x²-7x+2=0x²-7x=-2x²-7x+12,25=-2+12,25(x-3,5)²=10,25x-3,5=√0,41/2 x-3,5=-√0 ,41/2x₁= √0,41+7 /2 x₂=-√0,41+7 /2√0,41+7/2+(-√0,41+7/ 2) = 1/26) x²-x-30=0x²-x=30x²-x+0,25=30+0,25(x-0,5)²=30,25x-0,5=5,5 x-0,5=-5,5x₁=6 x₂= -56*(-5)=-306+(-5)= 6-5=1