3x²-7x+2=0
(3x-1)*(x-2)=0
x=1/3 or x=2
x²-2√2x=-2
x²-2√2x+2=0
(x-√2)²=0
x=√2
x（x-5）=14
x²-5x-14=0
(x-7)*(x+2)=0
x=7 or x=-2