EXERCICE 3

On s'intéresse à la factorisation de l'expression :
A(x) = 5(7-4x) +7(3x + 1) - 4x(3x + 1).

a. Factoriser l'expression B(x) = 7(3x + 1) - 4x(3x + 1).


b. En déduire une factorisation de l'expression A(x).
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