(1)x²-2x-1=0
x²-2x+1=2
(x-1)²=2
x=1+√2 x=1-√2
(2)y²-6y+6=0
y²-6y+9=3
(y-3)²=3
y=3+√3 y=3-√3
(3)3x²-6x+1=0
x²-2x=-1/3
x²-2x+1=2/3
(x-1)²=6/9
x=1+√6/3 x=1-√6/3
(4)5x²=6x+8
x²-6x/5=8/5
x²-6x/5+9/25=49/25
(x-3/5)²=49/25
x-3/5=7/5 x-3/5=-7/5
x=2 x=-4/5
(1)x²-2x-1=0
x²-2x+1=2
(x-1)²=2
x=1+√2 x=1-√2
(2)y²-6y+6=0
y²-6y+9=3
(y-3)²=3
y=3+√3 y=3-√3
(3)3x²-6x+1=0
x²-2x=-1/3
x²-2x+1=2/3
(x-1)²=6/9
x=1+√6/3 x=1-√6/3
(4)5x²=6x+8
x²-6x/5=8/5
x²-6x/5+9/25=49/25
(x-3/5)²=49/25
x-3/5=7/5 x-3/5=-7/5
x=2 x=-4/5