Réponse :
Explications étape par étape
Bonjour
f(x) = 5x - 3
5x - 3 = 7
5x = 7 + 3
x = 10/5
x = 2
f(6) = 5 * 6 - 3 = 30 - 3 = 27
5x - 3 = -28
5x = -28 + 3
x = -25/5
x = -5
f(x) = -2x - 5
f(1) = -2 * 1 - 5 = -2 - 5 = -7
f(-1/2) = -2 * (-1/2) - 5 = 1 - 5 = (-4)
-2x - 5 = 0
2x = -5
x = -5/2
f(x) = 0,3x
0,3x = 1,5
x = 1,5/0,3
x = 5
0,3x = 0,06
x = 0,06/0,3
x = 0,2
f(-10) = 0,3 * 10 = 3
f(x) = -x + 6
-x + 6 = -2
x = 6 + 2
x = 8
f(0) = -0 + 6 = 6
f(-3) = -(-3) + 6 = 3 + 6 = 9
f(x) = -3
f(5) = -3
f(15) = -3
-3 = 8 impossible
f(x) = 2/3 x - 5
2/3 x - 5 = -3
2/3 x = 5 - 3
x = 2 * 3/2
x = 3
f(-5) = 2/3 * (-5) - 5 = -10/3 - (5 * 3)/3 = -10/3 - 15/3 = -25/3
2/3 x - 5 = -8/3
2/3 x = 5 - 8/3
2/3 x = 15/3 - 8/3
x = 7/3 * 3/2
x = 7/2
