polynomial puzzle ;)

Let f(x)f(x) be a second degree polynomial such that f(11)=181f(11) = 181 and x22x+2f(x)2x24x+3x^2 - 2x + 2 ≤ f(x) ≤ 2x^2 - 4x + 3.

What is f(21)f(21)?

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