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Sagot :

XXX102

Bonsoir,

 

1)[tex]h(-1) = (-1)^2-4\times (-1)+15 = 1+4+15 = 20\\ h(5) = 5^2-5\times 4+15 = 25-20+15 = 20[/tex]

 

2)[tex]h(3)=12[/tex]

 

3)[tex]h(1{,}5) = 11{,}25 \neq -3\\ B \not\in \mathcal{C}_h[/tex]

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