Sagot :
Bonsoir,
A = (3x + 2)(3x - 2) + (2x - 1)(- x + 2)
A = 9x² - 4 - 2x² + 4x + x - 2
A = 7x² + 5x - 6
B = (3x - 1)² - (2x - 5)(- 3x + 2)
B = 9x² - 6x + 1 - (- 6x² + 4x + 15x - 10)
B = 9x² - 6x + 1 + 6x² - 4x - 15x + 10
B = 15x² - 25x + 11
A = (3x + 2)(3x - 2) + (2x - 1)(- x + 2)
A = 9x² - 4 - 2x² + 4x + x - 2
A = 7x² + 5x - 6
B = (3x - 1)² - (2x - 5)(- 3x + 2)
B = 9x² - 6x + 1 - (- 6x² + 4x + 15x - 10)
B = 9x² - 6x + 1 + 6x² - 4x - 15x + 10
B = 15x² - 25x + 11
Bonjour
♧ Developper, Réduire & Ordonner :
A = (3x+2)(3x-2)+(2x-1)(-x+2)
A = (3x)² - 2² - 2x² + 4x + x - 2
A = 9x² - 4 - 2x² + 5x - 2
A = 9x² - 2x² + 5x - 4 - 2
A = 7x² + 5x - 6
B = (3x-1)² -(2x-5)(-3x+2)
B = 9x² -6x + 1 - (-6x² + 4x + 15x - 10)
B = 9x² - 6x + 1 + 6x² - 19x + 10
B = 9x² + 6x² - 19x - 6x + 10 + 1
B = 15x² - 25x + 11
Voilà ^^
♧ Developper, Réduire & Ordonner :
A = (3x+2)(3x-2)+(2x-1)(-x+2)
A = (3x)² - 2² - 2x² + 4x + x - 2
A = 9x² - 4 - 2x² + 5x - 2
A = 9x² - 2x² + 5x - 4 - 2
A = 7x² + 5x - 6
B = (3x-1)² -(2x-5)(-3x+2)
B = 9x² -6x + 1 - (-6x² + 4x + 15x - 10)
B = 9x² - 6x + 1 + 6x² - 19x + 10
B = 9x² + 6x² - 19x - 6x + 10 + 1
B = 15x² - 25x + 11
Voilà ^^