Bonjour ,
Je te laisse l'opération finale
1 -> -4 ( x² +10x +25) +25 =-4x² -40x -100 +25 =
2 -> 4( x² +10x +25) -25 = 4x² +40x +100 -25 =
3 -> 4( x² -20x +100) +25 =4x² -80x +400 +25 =
4 -> 25 -4( x² -10x +25) = 25 -4x² +40x -100=
5 ->-4( x² +20x +100) +25 = -4x² -80x -400 +25 =
6 ->-25( x² +20x +100) +4= -25x² -500 -2500 +4
7 -> 25(x² -10x +25) -4 = 25x² -250x +625 -4=
7
