Sagot :
A = 5x*3 + 5x*(-2x) + 2x*4x + 2x*(-3)
= 15x - 10x² + 8x² - 6x
= -2x² + 9x
B = 3² - 2*3*2x + (2x)² - (2x*4x + 2x*(-5) - 3*4x - 3*(-5))
= 9 - 12x + 4x² - (8x² - 10x - 12x + 15)
= 9 - 12x + 4x² - 8x² + 22x - 15
= -4x² + 10x - 6
Réponse :
Bonjour
Explications étape par étape
A = 5x( 3 -2x) + 2x (4x -3)
A = 15x -10x² +8x² -6x
A = -2x² +9x
B = (3 -2x)² - (2x -3)(4x -5)
B = 9 -12x +4x² - ( 8x² -10x -12x +15)
B = 9 -12x +4x² - ( 8x² -22x +15)
B = 9 -12x +4x² -8x² +22x -15
B = +4x² +10x -6