(2x+8)(x-2)=x²+2x-17
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(2x+8)(x-2)=x²+2x-17
(2x+8)(x-2)=x²+2x-17
(2x+8)(x-2)=x²+2x-17
2x^2+8x-4x-16=x^2+2x-17
x^2+2x+1=0
(x+1)^2=0
x1=x2=-1
楼下答案不规范
(2x+8)(x-2)=x²+2x-17 2x²-4x+8x-16=x²+2x-17 x²+2x+1=0 (x+1)²=0 x=-1