Question

将抛物线y=a(x-h)^2+k先向左平移5个单位,再向下平移4个单位,得到新抛物线y=-1/2(x+2)^2 -3,求

Answer 1

左平移5个单位,y=a(x-h+5)^2+k

再下平移4个单位,y=a(x-h+5)^2+k-4

对比y=-1/2(x+2)^2 -3

得,a=-1/2,h=3,k=1.