Question

1.（x+2)²-5=0 2.2x²-x-3=0 3.x²-6x-5=0 4.(x+3)&

Answer 1

(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