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Sagot :

Bonjour,

Développer;

C= (2x+5)(3x+7)= 2x*3x+2x*7+5*3x+5*7= 6x²+14x+15x+35= 6x²+29x+35

D= (x+1)(x+5)= x*x+x*5+1*x+1*5= x²+5x+x+5= x²+6x+5

E= (4x+5)(2x+6)= 4x*2x+4x*6+5*2x+5*6= 8x²+24x+10x+30= 8x²+34x+30

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