The value of $f (2)$ if $f (x) = x^{3} + 7 x^{2} - 8 x + 9$

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Solution

$f (x) = x^{3} + 7 x^{2} - 8 x + 9 f (2) = 2^{3} + 7 (2)^{2} - 8 (2) + 9 f (2) = 8 + 28 - 16 + 9 = 29$

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