Find f(7) if $f (x) = x^{3} - {5 x}^{2} - 3 x$

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Solution

$f (x) = x^{3} - 5 x^{2} - 3 x f (7) = 7^{3} - 5 (7)^{2} - 3 (7) f (7) = 343 - 5 (49) - 21 f (7) = 343 - 245 - 21 f (7) = 74$

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