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Sagot :

Bonjour,

A = (2x + 3)² + (x - 2)(2x + 3)

(2x+3) ( 2x+3+ x-2) =

(2x+3)(3x  +1)  =

6x² +2x +9x +3 =

6x² +11x +3

B = (2t - 7) – (5t + 1)(2t - 7)​

(2t-7) ( 1 - 5t+1) =

(2t-7) ( -5t +2)=

-10t²  +4t +35t -14 =

-10t²  +39t -44

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