Sagot :
Bonsoir,
Factoriser :
(2x+3)(x+2)-5(2x+3)
= (x + 2 - 5) (2x + 3)
= (x - 3) (2x + 3)
(3x+4)(6x-2)+(3x+4)²
= (3x + 4) (3x + 4 + 6x - 2)
= (3x + 4) (9x + 2)
(x²-4)+(5x-1)(x+2)
= (3x + 6) (2x - 1)
= 3 (x + 2) (2x - 1)
bonjour
( 2 x + 3 ) ( x + 2 - 5 )
⇔ ( 2 x + 3 ) ( x - 3 )
( 3 x + 4 ) ( 6 x - 2 + 3 x + 4 )
⇔ ( 3 x + 4 ) ( 9 x + 2 )
( x² - 4 ) + ( 5 x - 1 ) ( x + 2 )
⇔ ( x - 2 ) ( x + 2 ) + ( 5 x - 1 ) ( x + 2 )
⇔ ( x + 2 ) ( x - 2 + 5 x - 1 )
⇔ ( x + 2 ) ( 6 x - 3 )
⇔ 3 ( x + 2 ) ( 2 x - 1 )