f(x) = 7x² + 14 × x!!! ÷ 2
f(6) = 7.6² + 14 × 6!!! ÷ 2
= (7.6.6) + 14 × (6.3) ÷ 2
= 252 + 14 × 18 ÷ 2
= 252 + 126
= 378
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f(x) = 7x² + 14 × x!!! ÷ 2
f(6) = 7.6² + 14 × 6!!! ÷ 2
= (7.6.6) + 14 × (6.3) ÷ 2
= 252 + 14 × 18 ÷ 2
= 252 + 126
= 378