The value of $f (3)$ if $f (x) = 2 x^{2} - x + 4$

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Solution

$f (x) = 2 x^{2} - x + 4 f (3) = 2 (3)^{2} - 3 + 4 f (3) = 2 (9) - 3 + 4 f (3) = 18 - 3 + 4 = 19$

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