Bonsoir,
1) f(x) = x² - 3
Aucune condition sur x.
Df = R
2) [tex]g(x) = \dfrac{1}{2x+1}[/tex]
Condition : 2x + 1 ≠ 0
2x ≠ -1
x ≠ -1/2
[tex]Dg=R-\{\dfrac{-1}{2}\}[/tex]
3) [tex]h(x)=\sqrt{2x+3}[/tex]
Condition : 2x + 3 ≥ 0
2x ≥ -3
x ≥ -3/2
[tex]Dh=[-\dfrac{3}{2},+\infty[[/tex]
