Sagot :
Réponse:
a) factoriser si possible les expressions
A= (x +5) [ 2x-3+x+5]
= (x+5) [ 3x+2]
A = (x+5) ( 3x+2)
B= (5x-12) [ 5x-12-4x-3]
=(5x-12) ( x-15)
B=( 5x-12) (x-15)
C = 36x2-100
C= 36 x2 -2x50
C= 2( 36-50)
C = 2x2 ( 18-25)
C= 4( 18-25)
option 1
A=0
x+5=0 ou 3x+2=0
x= -5 ou x = -2/3
B= 0
5x-12=0. ou. x-15=0
x= 12/5 ou. x= 15
Réponse :
Je vais t'aider.
Explications étape par étape
On va factoriser les expressions:
A= (x +5) [ 2x-3+x+5]
= (x+5) [ 3x+2]
= (x+5) ( 3x+2)
B= (5x-12) [ 5x-12-4x-3]
=(5x-12) ( x-15)
=( 5x-12) (x-15)
C = 36x2-100
= 36 x2 -2x50
= 2( 36-50)
= 2x2 ( 18-25)
= 4( 18-25)
On va résoudre les équation:
A=0
x+5=0 <=> 3x+2=0
x= -5 o<=> x = -2/3
B= 0
5x-12=0<=>. x-15=0
x= 12/5 <=> x= 15
Bonne journée!!!