Sagot :
f(x) = (4(x+2))-1
= (4x+8)-1
= 4x+7
f(1/2) = 4 x 1/2 - 7 = 2 - 7 = -5
f(x) = 0
4x+7=0
4x=-7
x=-7/4
f(x) = 3
4x+7=3
4x=-4
x=-4/4
x=-1
f(x) = (4(x+2))-1
Si x = 1/2, alors :
f(1/2) = (4(1/2 + 2))-1
= 4*1/2 + 4*2 - 1
= 2 + 8 - 1
= 9
Si x = -2 + v2, alors
f(-2 + V2) = (4(-2 + V2 + 2))-1
= - 8 + 4V2 + 8 - 1
= - 1 + 4V2
Si f(x) = 0, alors :
(4(x + 2))-1 = 0
4x + 8 - 1 = 0
4x + 7 - 7 = 0 - 7
4x / 4 = -7 / 4
x = - 7/4
Si f(x) = 3, alors :
(4(x+2))-1 = 3
4x + 8 - 1 = 3
4x + 7 - 7 = 3 - 7
4x / 4 = - 4/4
x = - 1