Aidez-moi, s'il vous plaît Factoriser:1° A(x) = (2+ 3x) (-x + 7) - (2 + 3x) (2x + 1)
4° A(x) = (x + 2)²-(x + 2) (2x - 1)
4° A(x) = (x + 2)²-(x + 2) (2x - 1)
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A(x) = (2+ 3x) (-x + 7) - (2 + 3x) (2x + 1)
= ( 2 + 3 x ) ( - x - 7 - 2 x - 2 )
= ( 2 + 3 x ) ( - 3 x - 9 )
= - 3 ( 2 + 3 x ) ( x + 3 )
A(x) = (x + 2)²-(x + 2) (2x - 1)
( x + 2 ) ( x + 2 - 2 x + 1 )
= ( x + 2 ) ( - x + 3 )