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Sagot :

B= -4x ( -7x +1 )
B= 28x2 - 4x

C= (7x+5 ) (2x + 3 )
C=14x2 + 21x + 10x +15
C= 14x2 + 31x + 15

D = (-x+5 ) (-3x-4)
D=3x2 + 4x - 15x -20
D= 3x2 - 11 x - 20

(28x2 )signifie 28 x au carré .

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