(2x+5)^2=x^2

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(2x+5)^2=x^2

(2x+5)^2=x^2
(2x+5)^2=x^2

(2x+5)^2=x^2
4x^2+20x+25=x^2
3x^2+20x+25=0
(3x+5)(x+5)=0
x1=-5/3,x2=-5

令2x+5=x解得x=-5

(2x+5)^2=x^2
4x^2+25+20x=x^2
3x^2+20x+25=0
(3x+5)(x+5)=0
x1=-3/5,x2=-5

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