-2/3x^2+6x怎么转化成二次函数y=a(x-h)^2+k

分类: 作业答案 • 2021-12-19 17:24:48

问题描述：

答

y=(-2/3)x^2 +6x
=(-2/3)[x^2 -9x]
=(-2/3)[x^2 -9x+(9/2)^2 -(9/2)^2]
=(-2/3)[x-(9/2)]^2 +(2/3)×(81/4)
=(-2/3)[x-(9/2)]^2 +(27/2)