(2x+1)²-(x+3)(3-x)=6x怎么简便算?

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(2x+1)²-(x+3)(3-x)=6x怎么简便算?
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(2x+1)²-(x+3)(3-x)=6x怎么简便算?
(2x+1)²-(x+3)(3-x)=6x怎么简便算?

(2x+1)²-(x+3)(3-x)=6x怎么简便算?
(2x+1)²-(x+3)(3-x)=6x
4x²+4x+1 - 9 +x² -6x = 0
5x² -2x - 8 = 0
x = 2±根号(4+160) / 10
= (2±2根号41) / 10
= 5分之 (1±根号41)
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