(2x+5)^2=x^2
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(2x+5)^2=x^2(2x+5)^2=x^2(2x+5)^2=x^24x^2+20x+25=x^23x^2+20x+25=0(3x+5)(x+5)=0x1=-5/3,x2=-5令2x+5=x解得x
(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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