Question
étudiez les signes des fonctions f(x)=(x-1)(x+5) g(x)=2x²-8x+16 h(x)=x²-18x+81 SVVVP :)
Asked by: USER7297
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Answer (102)
étudiez les signes des fonctions
f(x)=(x-1)(x+5)
f(x)≤0 si x∈[-5;1]
f(x)≥0 si x∈]-inf;-5] U [1;+inf[
g(x)=2x²-8x+16=2(x²-4x+8)=2(x-2)²+8
g(x)>0 si x∈IR
h(x)=x²-18x+81 =(x-9)²
h(x)≥0 si x∈IR
f(x)=(x-1)(x+5)
f(x)≤0 si x∈[-5;1]
f(x)≥0 si x∈]-inf;-5] U [1;+inf[
g(x)=2x²-8x+16=2(x²-4x+8)=2(x-2)²+8
g(x)>0 si x∈IR
h(x)=x²-18x+81 =(x-9)²
h(x)≥0 si x∈IR