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Sagot :

MAHAM

bonjour

a.

A = -3x(x²-4)

A = -3x³+12x

B = (2x+3)(2x-3)

B = (2x)²-3²

B = 4x²-9

b.

pour x = -1

A = -3×(-1)³+12×(-1)

A = 3-12

A=-9

pour x = 2/3

A = -3(2/3)³+12×2/3

A = -3×8/27 +24/3

A = -8/9 +8

A = 64/9

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