Y= -(1/2)x^2-x+3
=-(1/2)(x^2+2x-6)
=(-1/2)[(x+1)^2-7]
=(-1/2)(x+1)^2+7/2
先向下平移一个单位,得Y=(-1/2)(x+1)^2+7/2-1=(-1/2)(x+1)^2+5/2
再向右平移4个单位,Y=(-1/2)(x+1-4)^2+5/2=(-1/2)(x-3)^2+5/2
a
Y= -(1/2)x^2-x+3
=-(1/2)(x^2+2x-6)
=(-1/2)[(x+1)^2-7]
=(-1/2)(x+1)^2+7/2
先向下平移一个单位,得Y=(-1/2)(x+1)^2+7/2-1=(-1/2)(x+1)^2+5/2
再向右平移4个单位,Y=(-1/2)(x+1-4)^2+5/2=(-1/2)(x-3)^2+5/2
a