Bonjour
1) B(x) =
[tex] \frac{x}{x - 1} + 2 = \frac{x}{x - 1} + \frac{2(x - 1)}{x - 1} = \frac{x + 2x - 2}{x - 1} [/tex]
B(x) =
[tex] \frac{3x - 2}{x - 1} [/tex]
2) B(x) = 0
[tex] \frac{3x - 2}{x - 1} = 0 \\ 3x - 2 = 0 \\ 3x = 2 \\ x = \frac{2}{3} [/tex]
S = { 2/3 }
3) A(x) - B(x) =
[tex] \frac{x {}^{2} + 2x - 2 - (3x - 2)}{x - 1} = \frac{x {}^{2} + 2x - 2 - 3x + 2}{x - 1} [/tex]
=
[tex] \frac{x {}^{2} - x}{x - 1} = \frac{x(x - 1)}{x - 1} = x[/tex]
=