Sagot :
Bonjour,
5 Développe et réduis:
A=5+ (2x-7) (4-3x);
= 5+8x -6x² -28 +21x
= - 6x² +29x -23
B = 3− (4x + 1) (−x+2);
= 3+4x² -8x +x -2
= 4x² -7x +1
C= 5x-1+(2x-3) (3x+1);
= 5x-1 +6x² +2x -9x -3
= 6x² -2x -4
Excuse-moi pour l'erreur
D=4x² - (-5x+2)(x − 3);
= 4x² +5x² -15x -2x +6
= 9x² -17x +6
E = (2x-3) (x+5)-4 (2x-1)
2x² +10x -3x -15 -8x +4
= 2x² -x -11
Réponse :
bonjour
Explications étape par étape :
A=5+ (2x-7) (4-3x)
A=5+ 8x-6x²-28+21x
=-6x²+29x-23
B = 3− (4x + 1) (−x+2)
=3- [-4x²+8x-x+2]
=3+4x²-8x+x-2
=4x²-7x+1
C= 5x-1+(2x-3) (3x+1);
=5x-1 +6x²+2x-9x-3
=6x²-2x-4
D=4x² - (-5x+2)(x − 3)
=4x²-(-5x²+15x+2x-6)
=4x² + 5x²-15x-2x+6
=9x²-17x-6
E = (2x-3) (x+5)-4 (2x-1).
=2x²+10x-3x-15 -8x+4
=2x²-x-11