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ESTUROVA

Bonjour !

A = 5(x² + 3) - x

A = 5(3² + 3) - 3

A = 5(9 + 3) - 3

A = 5*12 - 3

A = 60 - 3

A = 57

B = 4x² + 2x + 3

B = 4*3² + 2*3 + 3

B = 4*9 + 6 + 3

B = 36 + 6 + 3

B = 45

C = 2(4x² + x + 3)

C = 2(4*3² + 3 + 3)

C = 2(4*9 + 3 + 3)

C = 2(36 + 3 + 3)

C = 2*42

C = 84

J'espère t'avoir aidé. Bon courage !
A) 5(x² + 3) - x = 5(3² + 3) = 5(9+3) = 5*12 = 60

B) 4x² + 2x + 3 = 4*3² + 2*3 + 3 = 4*9 + 6 + 3 = 36 + 6 + 3 = 45

C) 2(4x² + x + 3) = 2(4*3² + 3 + 3) = 2(4*9 + 3 + 3) = 2(36 + 3 + 3) = 2*42 = 84

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