Réponse :
bonsoir
Explications étape par étape :
réponses en pièce jointe
(6x + 1)(2x + 3) = 12x² + 18x + 2x + 3) = 12x² + 20x + 3
(x + 1)² = x² + x + x + 1 = x²+ 2x + 1
3(2x - 4) = 6x - 12
(x + 7)(x -7) = x²- 7x + 7x - 49 = x² - 49
4x(x -5) = 4x² - 20x
(2x - 1)² = 4x² - 2x -2x + 1 = 4x² - 4x + 1
(3x + 2)(x -1) = 3x² - 3x + 2x - 2 = 3x² - x - 2
(5x + 3)² = 25x² + 15x + 15x + 9 = 25x² + 30x + 9
-2x(3 + x) = -6x - 2x²= -2x² - 6x
(2x - 4)(2x + 4) = 4x² - 16
(2 - 3x)² = 4 -6x -6x + 9x² = 9x² - 12x + 4
(2x - 3) x (-4) = -8x + 12
(4x + 1)(4x + 1) = 16x² + 8x + 1
(4x - 3)(x - 2) = 4x²-8x - 3x + 6 = 4x² -11x + 6
(-6x + 1)(-6x - 1) = 36x²+ 6x - 6x - 1 = 36x² -1
(x + 4)(x + 7) = x² + 7x + 4x + 28 = x² + 11x + 28
bonne soirée
