Bonjour,
2.1) a=1 , b=-3 et c=2
2.2) une parabole
2.3) -b/2a = -(-3)/(2×1) = 3/2
2.4) décroissante sur x ∈ [-2 ; 3/2]
nulle quand x = 3/2
croissante sur x ∈ [3/2 ; 3]
2.5) f(-2) = (-2)²-3(-2)+2 = 4+6+2 = 12
f(-1) = (-1)²-3(-1)+2 = 1+3+2 = 6
f(0) = 0²-3(0)+2 = 0+0+2 = 2
f(1) = 1²-3(1)+2 = 1-3+2 = 0
f(2) = 2²-3(2)+2 = 4-6+2 = 0
f(3) = 3²-3(3)+2 = 9-9+2 = 2
2.6) voir pièce jointe
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Bonjour,
2.1) a=1 , b=-3 et c=2
2.2) une parabole
2.3) -b/2a = -(-3)/(2×1) = 3/2
2.4) décroissante sur x ∈ [-2 ; 3/2]
nulle quand x = 3/2
croissante sur x ∈ [3/2 ; 3]
2.5) f(-2) = (-2)²-3(-2)+2 = 4+6+2 = 12
f(-1) = (-1)²-3(-1)+2 = 1+3+2 = 6
f(0) = 0²-3(0)+2 = 0+0+2 = 2
f(1) = 1²-3(1)+2 = 1-3+2 = 0
f(2) = 2²-3(2)+2 = 4-6+2 = 0
f(3) = 3²-3(3)+2 = 9-9+2 = 2
2.6) voir pièce jointe