Question

将抛物线x+4=a(y-3)^2(a不等于0)按向量(4,-3)平移后所得抛物线的焦点坐标为

Answer 1

抛物线x+4=a(y-3)^2(a不等于0)按向量(4,-3)平移后所得抛物线为：x+4-4=a(y-3+3)^2

即：x=ay^2

y^2=x/a

焦点坐标为：(1/4a,0)