(x-3)²=9-x²怎么做谢了

(x-3)²=9-x²怎么做谢了
(x-3)²=9-x²怎么做谢了

(x-3)²=9-x²怎么做谢了
(x-3)²=9-x²
(x-3)²- ( x²- 9 ) = 0
(x-3)²- ( x+3 )(x-3) = 0
(x-3) (x-3-x-3) = 0
(x-3 ) x (-6) = 0
x =3
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