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4x-9≤f(x)≤x²-4x+7
4(4) -9 ≤ f(x) ≤4² - 4.4 + 7
7 ≤f(4)≤ 7
f(4) = 7
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4x-9≤f(x)≤x²-4x+7
4(4) -9 ≤ f(x) ≤4² - 4.4 + 7
7 ≤f(4)≤ 7
f(4) = 7