Exercice 2
(-3x + 1 ) (2 - 5x)
-3x x 2 - 5x x (-3x) + 1 x 2 - 5x x 1
-6x + 15x^2 + 2 - 5x
-11x + 15x^2 + 2
(6x + 7)^2
(6x)^2 + 2 x 6x x 7 + 7^2
36x^2 + 84x + 49
(10x - 2) (10x + 2)
10x x 10x + 10x x 2 - 2 x 10x - 2 x 2
100x^2 - 4
(2x - 4)^2 + 3x (1 - x)
(2x)^2 - 2 x 2x x (-4) + 3x x 1 - 3x x 1x
4x^2 + 16x + 3x - 3x^2
x^2 + 19x
Je ne suis pas très sure de celle ci
