Sagot :
bonsoir
f (x) = ( 3 x + 5 ) / ( 2 x - 3 )
( 3 x + 5 ) / ( 2 x - 3 ) = 3
( 3 x + 5 ) / ( 2 x - 3 ) - 3 ( 2 x - 3 ) / (2 x - 3) = 0
( 3 x + 5 - 6 x + 9 ) / ( 2 x - 3 ) = 0
( - 3 x + 14 ) / ( 2 x - 3 ) = 0
x = 14/3
antécédent de 3 = 14/3
f (x) = ( 3 x + 2 ) ( - 5 x + 8 )
f (x) = - 15 x² + 24 x - 10 x + 16 = - 15 x² + 14 x + 16
- 15 x² + 14 x + 16 = 16
- 15 x² + 14 x = 0
x ( - 15 x + 14 ) = 0
x = 0 ou 14/15