bonjour vous pouvez m'aidez svp?

Developper puis réduire

A=(3x-5) (2x-7) - (6x-5)

B=(6x-5) (3x-4) - (5x+2)²

C=(4x+3) (5x-1) - (5x-1) (9x+5)

D= 5(2x+5) (3x-2)

E=2(3x+1) (2x+5) - (6x-1) (7x-3)

F=(2x+3) (x-1) (4x-5)

x=petit x pas fois

Pouvez-vous faire les etapes intermediaire svp ? Merci beaucoup

2

Réponses

2013-01-31T17:50:31+01:00

A = (6x²-21x-10x+35) - (6x-5)

= 6x² -31x+35-6x+5

= 6x²-37x+40

 

B = (18x²-24x-15x+20) - (25x²+20x+4)

= 18x²-39x+20-25x²-20x-4

= -7x²-59x+16

 

C = (20x²-4x+15x20x-3) - (45x²+25x-9x-5)

= 20x²-31x-3) - (45x²+16x-5)

= 20x²-31x-3-45x²-16x+5

= -25x²-47x+2

D = 10x+25(3x-2)

= 10x+75x-50

= 85x-50

E = 6x+2(2x+5) - (42x²-18x-7x+3)

= 6x+4x+10-42x²+18x+7x-3

= -42x²35x+7

F = (2x²-2x+3x-3)(4x-5)

= 2x²+x-3 (4x-5)

= 8x^3-10x²+4x²-5x-12x+15

= 8x^3-6x²-17x+15

2013-01-31T18:13:56+01:00

 

A = (6x²-21x-10x+35) - (6x-5)

= 6x² -21x-10+35-6x+5

=6x²-31x+35-6x+5

= 6x²-37x+40

 

 

B = (18x²-24x-15x+20) - (25x²+20x+4)

= 18x²-24x-15x+20-25x²-20x-4

=18x²-39x+20-25x²-20x-4

= -7x²-59x+16

 

C = (20x²-4x+15x20x-3) - (45x²+25x-9x-5)

= 20x²-31x-3) - (45x²+16x-5)

= 20x²-31x-3-45x²-16x+5

= -25x²-47x+2

 

D = 10x+25(3x-2)

= 10x+75x-50

= 85x-50

 

E = 6x+2(2x+5) - (42x²-18x-7x+3)

= 6x+4x+10-42x²+18x+7x-3

= -42x²+35x+7

 

F = (2x²-2x+3x-3)(4x-5)

= 2x²+x-3 (4x-5)

= 8x^3-10x²+4x²-5x-12x+15

= 8x^3-6x²-17x+15