Sagot :
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
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