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Verified answer
F(x)=14x³+7x²-5x-18F(3)=14•3³+7•3²-5•3-18
=338+63-15-18
=468
f(x) = 14x³ + 7x² - 5x - 18
f(3) = 14(3)³ + 7(3)² - 5(3) - 18
f(3) =(14)(27) + (7)(9) - 15 - 18
f(3) = 378 + 63 - 15 - 18
f(3) = 408
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