(x+2)(x+3)=3x+9

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(x+2)(x+3)=3x+9(x+2)(x+3)=3x+9(x+2)(x+3)=3x+9(x+2)(x+3)=3x+9(x+2)(x+3)-3(x+3)=0(x+2-3)(x+3)=0(x-1)(x

(x+2)(x+3)=3x+9
(x+2)(x+3)=3x+9

(x+2)(x+3)=3x+9
(x+2)(x+3)=3x+9
(x+2)(x+3)-3(x+3)=0
(x+2-3)(x+3)=0
(x-1)(x+3)=0
x1=1 x2=-3

X2+3X+2X+6=3X+9
X2+2X-3=0
(X+3)(X-1)=0
X+3=0或X-1=0
X=-3或X=1

x^2+5x+6=3x+9
x^2+2x-3=0
(x-1)(x+3)=0
x=1或-3
就这样做