Y=2x²-4x-1
=2[(x²-2x+1)-1]-1
=2[(x-1)²-1]-1
=2(x-1)²-2-1
=2(x-1)²-3
此抛物线的顶点是(1,-3)
将它沿直线x=-1翻折,则顶点变为(-3,-3),但抛物线的开口方向和开口的大小不变,
则所得的抛物线的解析式是:y=2(x+3)²-3=2x²+12x+15
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