y=-1/2x²+2x+2化简成y=a(x-h)²+k的形式
问题描述：
y=-1/2x²+2x+2化简成y=a(x-h)²+k的形式
答
y=-1/2(x²-4x)+2
=-1/2(x²-4x+4-4)+2
=-1/2(x²-4x+4)+2+2
=-1/2(x-2)²+4