x方+6x=1
x方+6x+9=1+9
(x+3)方=10
x+3=±√10
x=-3±√10
x方-14x=8
x方-14x+49=8+49
(x-7)方=57
x-7=±√57
x=7±√57
x方+2x+2=8x+4
x方-6x=2
x²-6x+9=2+9
(x-3)方=11
x-3=±√11
x=3±√11