Y=-(X-2)(X+3)用配方法或公式法求顶点座标.
问题描述:
Y=-(X-2)(X+3)用配方法或公式法求顶点座标.
答
Y=-(X-2)(X+3)
=-(x²+3x-2x-6)
=-(x²+x-6)
=-(x²+x+1/4)+6+1/4
=-(x+1/2)²+25/4
顶点座标(-1/2,25/4)