Bonsoir,
Développer et réduire:
A = 2(3x + 2) - (x - 5)
A = 2*3x + 2*2 - (x - 5)
A = 6x + 4 - (x - 5)
A = 6x + 4 - x + 5
A = 5x + 9
A = 5*2 + 9
A = 10 + 9
A = 19
B = 5x(x + 4)
B = 5x*x + 5x*4
B = 5x² + 20x
B = 5*(-3)² + 20*(-3)
B = 5*9 + (-60)
B = 45 - 60
B = -15
D = 3(2x + y) - (x - y)
D = 3*2x + 3*y - (x - y)
D = 6x + 3y - (x - y)
D = 6x + 3y - x + y
D = 5x + 2y
C = 3x(x + 5)
C = 3x*x + 3x*5
C = 3x² + 15x
✅
* = multiplication
Bonne soirée.