Répondre :
fx --> -3X + 2
g: x --> -2/3 x + 1
h: x --> 3.2x - 5
f (3)=-7
f ( 0)=2
f (−2) = 8
f ( 11/3 ) = −9
f (−5/3 ) = 7
f ( -1/5 ) = 13/5
g (3) = -1
g ( 9 ) = 7
g (−2)= 7/3
g ( 1 ) = 1/3
g ( 3/4 ) =1/2
g ( 1/4 ) = 5/6
f : x → -3x + 2
g : x → -2/3 x + 1
h : x → 3.2 x - 5
f(3) = -7 car f(3) = -3(3) + 2 = -9 + 2 = -7
f(0) = 2 car -3x + 2 = 2 ⇔ -3x = 2 - 2 ⇔ x = 0
f(-2) = 8 car f(-2) = -3(-2) + 2 = 6 + 2 = 8
f(11/3) = -9 car -3x + 2 = -9 ⇔ -3x = -9 - 2 ⇔ x = -11/-3 = 11/3
f(-5/3 ) = 7 car f(-5/3) = -3(-5/3) + 2 = 5 + 2 = 7
f(-1/5) = 13/5 car -3x + 2 = 13/5 ⇔ -3x = 13/5 - 10/5 ⇔ x = 3/5 × 1/-3 = -1/5
g(3) = -1 car -2/3 (3) + 1 = -2 + 1 = -1
g(-9) = 7 car -2/3 x + 1 = 7 ⇔ -2/3 x = 7 - 1 ⇔ x = 6 × -3/2 = -9
g(-2) = 7/3 car -2/3 (-2) + 1 = 4/3 + 1 = 7/3
g(1) = 1/3 car -2/3 x + 1 = 1/3 ⇔ -2/3 x = 1/3 - 3/3 = -2/3 ⇔ x = 1
g(3/4) = 1/2 car -2/3 (3/4) + 1 = -6/12 + 1 = 1/2
g(1/4) = 5/6 car -2/3 x + 1 = 5/6 ⇔ -2/3 x = -1/6 ⇔ x= -1/6 × -3/2 = 1/4