1 . F(x)= [ 2x X 3x - 2x X 1 - 3 X 3x + 3 X 1 ] + [ (2x)" au carré" + 2 X 2x X 3 - 3 " au carré" ]
= [ 36x "au carré" -2x - 9x + 3] + [ 4x "au carré" + 12x -9 ]
= 6x "au carré" -2x - 9x + 3 + 4x "au carré" + 12x -9
= 10x " au carré" + x - 6
2. 10 X (3/2" au carré" ) + 3/2 -6 ... Je te laisse calculer ..
3. F(x) = 2x -3 ( 3x - 1 + 2x - 3 )
Le 4 arrive