Réponse :
Bonsoir
Explications étape par étape
1) f(x) = 3x^2-5
a) f(8) = 3*8^2-5
f(8) = 3*64-5
f(8) = 192-5
f(8) = 187
f(-4) = 3*(-4)^2-5
f(-4) = 3*16-5
f(-4) = 48 - 5
f(-4) = 43
b) 3x^2-5 = -5
3x^2 = -5+5
3x^2 =0
X^2 = 0/3
X = 0
2) g(-0.1)=2
g(0)=1
g(0.9)=-4
g(0.7)=-0.1
g(1.1)=5
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Réponse :
Bonsoir
Explications étape par étape
1) f(x) = 3x^2-5
a) f(8) = 3*8^2-5
f(8) = 3*64-5
f(8) = 192-5
f(8) = 187
f(-4) = 3*(-4)^2-5
f(-4) = 3*16-5
f(-4) = 48 - 5
f(-4) = 43
b) 3x^2-5 = -5
3x^2 = -5+5
3x^2 =0
X^2 = 0/3
X = 0
2) g(-0.1)=2
g(0)=1
g(0.9)=-4
g(0.9)=-4
g(0.7)=-0.1
g(1.1)=5