Bonjour, pouvez-vous m'aider pour cette exercice svp :
Exercice 1 : Développer et réduire
A = (x− 5)(2x + 5) + (x − 4)(x + 4)
B = (– x + 2)(−3x + 4) − (x + 1)(−2x + 1)
C= −2(x + 1)(x + 2)
Exercice 1 : Développer et réduire
A = (x− 5)(2x + 5) + (x − 4)(x + 4)
B = (– x + 2)(−3x + 4) − (x + 1)(−2x + 1)
C= −2(x + 1)(x + 2)
More Questions From This User See All
Lista de comentários
Bonsoir,
A = (x - 5)(2x + 5) + (x - 4)(x + 4)
A = 2x² + 5x - 10x - 25 + x² - 4²
A = 3x² - 5x - 25 - 16
A = 3x² - 5x - 41
B = (-x + 2)(-3x + 4) - (x + 1)(-2x + 1)
B = 3x² - 4x - 6x + 8 - (-2x² + x - 2x + 1)
B = 3x² - 10x + 8 + 2x² - x + 2x - 1
B = 5x² - 9x + 7
C = -2(x + 1)(x + 2)
C = (-2x - 2)(x + 2)
C = -2x² - 4x - 2x - 4
C = -2x² - 6x - 4
bonsoir;
A = (x− 5)(2x + 5) + (x − 4)(x + 4)
= 2x² +5x -10x -25 + x² +4x-4x -16
= 3x² -5x +41
B = (– x + 2)(−3x + 4) − (x + 1)(−2x + 1)
= 3x² -4x -6x +8 -( -2x² +x -2x +1)
= 3x² -4x -6x +8 +2x² -x +2x -1
= 5x² -9x +7
C= −2(x + 1)(x + 2)
= (-2x -2)(x+2)
= -2x² -4x -2x -4
= -2x² -6x -4