Sagot :
Réponse :
Explications étape par étape
g(x) = 2x-7
1/ g(-4) = 2. -4 - 7 = -15
2/ 2x-7 = -13
⇔2x = -6
⇔x = -6/2
⇔x = -3
3/ -1 a pour image -9 2x-7 = -9
⇔ 2x = -2
⇔ x = -1
4/ g(3) = 2. 3 -7 = -1
5/ g(x) = 1
2x-7 = 1
⇔2x = 8
⇔x = 4
Soit x∈R.
1) on a :
g(-4) = 2*-4 -7 = -15
2) on pose :
g(x) = -13 ⇔ 2x - 7 = -13 ⇔ x = -3
3) on pose :
g(x) = -9 ⇔ 2x - 7 = -9 ⇔ x = -1
4) on a :
g(3) = 2*3 - 7 = -1
5) on pose :
g(x) = 1 ⇔ 2x-7 = 1 ⇔ x = 4