bonjour
ex 3)
A = 3*x+3*2 = 3(x+2)
B = 4x - 8 = 4x - 2 * 4 = 4(x-2)
C= 12x + 20 = 4*3x+4*5=4(3x+5)
D = x² -5x = x(x-5)
à toi de faire la E et la F
Ex 4 )
A = x-7+1+3x = 4x -6
B = 3x+4-2-4x = -x + 2
C = 6x² +5 -9x +8x-10+3x² = 9x² - x -5
D = 2x-9+(2-5x) = 2x -5x -9+2 = - 3x -7
à toi de faire la E et la F
fais attention aux signes
si tu as des questions n'hésite pas
Réponse :
EX3 factoriser
A = 3 x + 3*2 = 3(x + 2)
B = 4 x - 8 = 4(x - 2)
C = 12 x + 20 = 4(3 x + 5)
D = x² - 5 x = x(x - 5)
E = 3 x² + 8 x = x(3 x + 8)
F = 4 x² - 2 x = 2 x(2 x - 1)
EX4 réduire les expressions
A = x - 7 + 1 + 3 x = 4 x - 6
B = 3 x + 4 - 2 - 4 x = - x + 2
C = 6 x² + 5 - 9 x + 8 x - 10 + 3 x² = 9 x² - x - 5
D = 2 x - 9 + (2 - 5 x) = 2 x - 9 + 2 - 5 x = - 3 x - 7
E = - 4 x² - 5 x - (x - 4) = - 4 x² - 5 x - x + 4 = - 4 x² - 6 x + 4
F = 8 x - 11 - (4 x² - 9 x - 6) = 8 x - 11 - 4 x² + 9 x + 6 = - 4 x² + 17 x - 5
Explications étape par étape