(x+√2)^2-x-√2=0(x+√2)^2-(x+√2)=0(x+√2)(x+√2-1)=0x+√2=0x=-√2或者x+√2-1=0x=1-√2
(X+6)²-9=0 (X+6)²=0+9=9 (X+6)²=3² X+6=3 X=3-6=-3