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5 Développe et réduis: A=5+ (2x-7) (4-3x); B = 3− (4x + 1) (−x+2); C= 5x-1+(2x-3) (3x+1); D=4x² - (-5x+2)(x − 3); E = (2x-3) (x+5)-4 (2x-1). 5 Développe et réduis : A = 5 + ( 2x - 7 ) ( 4-3x ) ; B = 3− ( 4x + 1 ) ( −x + 2 ) ; C = 5x - 1 + ( 2x - 3 ) ( 3x + 1 ) ; D = 4x² - ( -5x + 2 ) ( x − 3 ) ; E = ( 2x - 3 ) ( x + 5 ) -4 ( 2x - 1 ) .​

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

View image HIRONDELLE52

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

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