Sagot :
Bonjour,
10x - 1 + ( 4x + 4 ) × ( -2x + 5 )
priorité aux multiplications:
double distributivité
( 4x + 4 ) × ( -2x + 5 )
4x* -2x = -8x²
4x* 5 = 20x
4 * -2x= -8x
4* 5 = 20
10x -1 -8x² +20x -8x +20=
On regroupe: -8x²
-8x² + 10x +20x -8x +20 -1 =
-8x² +30x +19
Excuse- moi !