A=(4x-1)²-(4x-1)(2x+7) 1) developer A 2)factoriser A 3) Resoudre A=0 MERCI!!!!!!
Mathématiques
jordykylle
Question
A=(4x-1)²-(4x-1)(2x+7)
1) developer A
2)factoriser A
3) Resoudre A=0
MERCI!!!!!!
1) developer A
2)factoriser A
3) Resoudre A=0
MERCI!!!!!!
1 Réponse
-
1. Réponse winner123
bonsoir
a = 16 x² - 8 x + 1 - ( 8 x² + 28 x - 2 x - 7)
a = 16 x² - 8 x + 1 - 8 x² - 28 x + 2 x + 7
a = 8 x² - 34 x + 8
a = ( 4 x -1) ( 4 x - 1 - 2 x - 7)
a = ( 4 x - 1) ( 2 x - 8)
a = 0
soit 4 x -1 = 0
4 x = 1
x = 1/4
soit 2 x -8 = 0
2 x = 8
x = 8/2
x = 4