bonjour
A = ( 4 x + 5 ) ( x - 7 ) + 4 x + 5
= ( 4 x + 5 ) ( x - 7 ) + 1 ( 4 x + 5 )
= ( 4 x + 5 ) ( x - 7 + 1 )
= ( 4 x + 5 ) ( x - 6 )
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bonjour
A = ( 4 x + 5 ) ( x - 7 ) + 4 x + 5
= ( 4 x + 5 ) ( x - 7 ) + 1 ( 4 x + 5 )
= ( 4 x + 5 ) ( x - 7 + 1 )
= ( 4 x + 5 ) ( x - 6 )