bonjour
f(x) = 3 x + 1
f( -5) = - 15 + 1 = - 14
f( 1/4) = 3/4 + 1= 3/4 + 4/4 = 7/4
f( √7) = 3 √7 + 1
antécédents de 1
3 x + 1 = 1
3 x = 1 - 1
3 x = 0 donc x = 0
3 x + 1 = - 5
3 x = - 5 - 1
3 x = - 6
x = - 2
3 x + 1 = 1/4
3 x = 1/4 - 1
3 x = 1/4 - 4/4
3 x = - 3/4
x = - 3/12 = - 1/4
