Bonsoir,
1. Développer les expressions:
a)
x(x + 5) = x*x + x*5 = x² + 5x ✅
b)
-5(y + 8) = -5*y + (-5)*8 = -5y - 40 ✅
c)
-4(x - 3) = -4*x + (-4)*(-3) = -4x + 12 ✅
2. Factoriser les expressions :
a)
8x + 16 = 8*x + 8*2 = 8(x + 2) ✅
b)
3y - 3 = 3*y - 3*1 = 3(y - 1) ✅
c)
13z + 52 = 13*z + 13*4 = 13(z + 4) ✅
3. Réduire les expressions :
a)
x² + 5x + 3 - 3x² + 4x - 3
= x² - 3x² + 5x + 4x + 3 - 3
= -2x² + 9x ✅
b)
5(y + 1) - 4y
= 5y + 5 - 4y
= y + 5 ✅
c)
8x - (3x - 6)
= 8x - 3x + 6
= 5x + 6 ✅
* = multiplication
Bonne journée
