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Sagot :

Bonjour,

A développer:

B= 2(5+x)+8x²= 10+2x+8x² <=> 8x²+2x+10

C= 3x+7(3x+2)= 3x+21x+14= 24x+14

D= 8x+7+3(2x-1)= 8x+7+6x-3= 14x+4

B= (x+2)(x+1)+9x²= x*x+2*x+x*1+2*1+9x²= x²+3x+2+9x²= 10x²+3x+2

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