bonjour
f(x) = - 2 x + 5
g (x) = 0.5 x
f (x) < g(x)
- 2 x + 5 < 0.5 x
- 2 x - 0.5 x < - 5
- 2.5 x < - 5
x > 2
S ] 2 ; + ∞ [
f (x) = 3 x + 2
g (x) = x/4 - 3 /4
f (x) < g (x)
3 x + 2 < x /4 - 3/4
12 x / 4 + 8/4 < x/4 - 3/4
12 x - x < - 8/4 - 3/4
11 x < - 11/4
x < - 11/44
S ] - ∞ ; - 11/44 [