# The maximum value of the function

Algebra Level 4

The maximum value of the function $$f(x)=2x{ }_{ }^{ 3 }-15x{ }_{ }^{ 2 }+36x-48$$ on the set
$$A=\left\{ { x }|{ { x }_{ }^{ 2 }+20\le 9x| } \right\}$$ is,

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