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Answered

Développer et réduire : A=(3x-5)(7x-4)
                                  B=2x²-5+4x(3-5)

Factoriser: D= (4x-5)(3x+6)+(4x-5)(8x-9)
                 E=(3x-2)(5x-3)-(5x-3)(6x-7)
Urgent aidez moi svp !

Sagot :

DROOPETTE
Développer et réduire :
A=(3x-5)(7x-4)
=21x²-12x-35x+20
=21x²-47x+20

B=2x²-5+4x(3-5)
=2x²-5+12x-20x
=2x²-8x-5

Factoriser:
D= (4x-5)(3x+6)+(4x-5)(8x-9)
=(4x-5)(3x+6+8x-9)
=(4x-5)(11x-3)

E=(3x-2)(5x-3)-(5x-3)(6x-7)
=(5x-3)(3x-2-6x+7)
=(5x-3)(-3x+5)
A= 21x^2 - 12x- 35x +20
A= 21x^2 - 47x +20

B= 2x^2 -5+12x-20
B= 2x^2 + 12x -15

D= (4x-5)(3x+6+8x-9)
D= (4x-5)(11x+3)

E= (5x-3)(3x-2+6x-7)
E= (5x-3)(9x-9)

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