Sagot :
bonjour
A = x - 4 x² - 2 + 8 x + 2 x + 2
A = - 4 x² + 11 x
B = - 4 x² - 6 x - 10 x - 15 - 15 x + 12
B = - 4 x² - 31 x - 3
- 4 x² + 11 x = - 4 x² - 31 x - 3
- 4 x² + 4 x² + 31 x + 11 x = - 3
42 x = - 3
x = - 3 /42 = - 1 /14
Bonjour!
A = (x-2)(1-4x)+2(x+1)
= x -4x² -2 + 8x + 2x + 2
= -4x² + 11x
B = (2x+5)(-2x-3)-(15x-12)
=-4x² -6x -10x -15 -15x + 12
= -4x² -31x -3
-4x² + 11x = -4x² - 31x -3
11x = -31x -3
42x = -3
x = -3/42
x = -1/14