bonjour
d.
pour x∈ R ;
(x+1)²≥0
4(x+1)²≥0
4(x+1)²-1≥-1
f(x) ≥-1
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bonjour
d.
pour x∈ R ;
(x+1)²≥0
4(x+1)²≥0
4(x+1)²-1≥-1
f(x) ≥-1