(1)x+2=±5
x=-2±5
(2)(x+1)(2x-3)=0
x=-1或3/2
(3)x={6±√[6^2-4x(-5)]}/2
=(6±√56)/2
=3±√14
(4)(x+3)²=2(x+3)
(x+3)²-2(x+3)=0
(x+3)(x+3-2)=0
(x+3)(x+1)=0
x=-3或-1第三题能用配方法写一下吗(3)(x-3-√14)(x-3+√14)=0
x=3+√14或3-√14