Sagot :
Réponse :
Explications étape par étape
Bonsoir
Compléter la pyramide :
......| a x b |
...|...a...|....b...|
.................|......A........|
...........|......B....|........C.......|
......|....D.....|.....E.......|........F........|
...|..3....|..2x - 1 |.....(-2).....|.....0,5....|
D = 3(2x - 1) = 6x - 3
E = (-2)(2x - 1) = -4x + 2
F = (-2) * 0,5 = (-1)
B = D * E = (6x - 3)(-4x + 2) = -24x^2 + 12x + 12x - 6 = -24x^2 + 24x - 6
C = E * F = (-4x + 2) * (-1) = 4x - 2
A = B * C = (-24x^2 + 24x - 6)(4x - 2)
A = -96x^3 + 48x^2 + 96x^2 - 48x - 24x + 12
A = -96x^3 + 144x^2 - 72x + 12
.....................| -96x^3 + 144x^2 - 72x + 12 |
.............| -24x^2 + 24x - 6 | ................4x - 2.....|
.......| 6x - 3..........|.........-4x + 2.........|...........(-1)......|
...|..3..........|.....2x - 1........|.........(-2)..........|..........0,5...|