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Sagot :

Réponse :

Explications étape par étape :

1. f (x) = 3 x + 7 + 21 x²

f(2) = 3×2+7+21×(2²)

= 6 + 7 + 21 × 4

= 6 + 7 + 84

= 97

2. f (x) = 3 x + 7 + 21 x²

f (6) = 3 x 6 + 7 + 21 x (6)²

= 18 + 7 + 21 + 36

= 18 + 7 + 57

= 82

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