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Développer et réduire chaque expression. 

A= 5(4x - 7) + ( x + 9) (5x - 6) 

B = (x - 5) (x + 7) + (2x - 4) (3x - 1) 

C= 3x ( x + 2) - (2x + 1)(x + 5) 

Sagot :

A=5(4x-7)+(x+9)(5x-6)
A=20x-35+5x²-6x+45x-54
A=5x²+59x-89

B=(x-5)(x+7)+(2x-4)(3x-1)
B=x²+7x-5x-35+6x²-2x-12x+4
B=7x²-12x-31

C=3x(x+2)-(2x+1)(x+5)
C=3x²+6x-(2x²+10x+x+5)
C=3x²+6x-2x²-10x-x-5
C=x²-5x-5

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