函数y=(1/3)^-2x^2-8x+1,(3<=x<=1)的值域是

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函数y=(1/3)^-2x^2-8x+1,(3<=x<=1)的值域是函数y=(1/3)^-2x^2-8x+1,(3<=x<=1)的值域是函数y=(1/3)^-2x^2-8x+1,(3<=x<=1)的值

函数y=(1/3)^-2x^2-8x+1,(3<=x<=1)的值域是
函数y=(1/3)^-2x^2-8x+1,(3<=x<=1)的值域是

函数y=(1/3)^-2x^2-8x+1,(3<=x<=1)的值域是
-2x^2-8x+1
=-2(x+2)^2+9
-3