Répondre :
Factorisation les expressions suivantes :
E=25x²-15x
= 5 x ( 5 x - 3 )
F= (7x+2)(5x+3)-(7x+2)
= ( 7 x + 2 ) ( 5 x + 3 - 1 )
= ( 7 x + 2 ) ( 5 x + 2 )
G=(2x+3)(x-2)-(4x+6)(x+2)
= ( 2 x + 3 ) ( x - 2 ) - 2 ( 2 x + 3 ) ( x + 2 )
= ( 2 x + 3 ) ( x - 2 - 2 x - 4 )
= ( 2 x + 3 ) ( - x - 6 )
C=4x²-12+9+ (2x-3)(4-3x)
= ( 2 x - 3 )² + ( 2 x - 3 ) ( 4 - 3 x )
= ( 2 x - 3 ) ( 2 x - 3 + 4 - 3 x )
= ( 2 x - 3 ) ( - x + 1 )