设抛物线的解析式y=k(x+1)²+|2|∴y=k(x+1)²+2或y=k(x+1)²-2①y=k(x+1)²+2与x轴交于点A(-3,0)∴0=k(-3+1)²+2k=-1/2∴2y=-(x+1)²+4②y=k(x+1)²+2与x轴交于点A(-3,0)∴0=k(-3+1)
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