如何将y= -1/20x^2+10x-440化为-1/20(x-100)^2+60?

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如何将y= -1/20x^2+10x-440化为-1/20(x-100)^2+60?

如何将y= -1/20x^2+10x-440化为-1/20(x-100)^2+60?
如何将y= -1/20x^2+10x-440化为-1/20(x-100)^2+60?

如何将y= -1/20x^2+10x-440化为-1/20(x-100)^2+60?
-1/20x^2+10x-440
=-1/20(X方-200X)-440
=-1/20(X方-200X+100方)+100方*1/20-440
=-1/20(X-100)方+60