Question

请帮我把这个二次函数解析式配一下方，配成顶点式，我忘了怎么配了。。

y=（10+X）(500-10X)

Answer 1

y=a(x-h)^2+k
这个就是顶点式
顶点坐标可以直接读取（h,k）

Answer 2

顶点式：y=a(x-h)^2+k

解：
y=(10+x)(500-10x)
=5000-100x+500x-10x^2
=-10x^2+400x-5000
=-10x^2-40x-4000+9000
=-10(x^2-40x+4000)+9000
=-10(x-20)^2+9000

Answer 3

y=5000-100x+500x-10x方
y=-10(x方-50x-500)
y=-10(x方-50x+625-625-500)
y=-10(x-25)方+11250
顶点坐标（25,11250)
不会可以追问

Answer 4

y=-10x^2+400x+5000=-10(x-20)^2+9000

Answer 5

y=5000 500x-100x-10x²=-x² 40x 500