2x²-8=0.2x²-8=0(2x+3)²+3=0(x-1)²-4=0

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2x²-8=0.2x²-8=0(2x+3)²+3=0(x-1)²-4=0

2x²-8=0.2x²-8=0(2x+3)²+3=0(x-1)²-4=0
2x²-8=0.
2x²-8=0
(2x+3)²+3=0
(x-1)²-4=0

2x²-8=0.2x²-8=0(2x+3)²+3=0(x-1)²-4=0
第一个是x=2 第三个是x=3