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Athe62
@Athe62
April 2019
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Résoudre les équations :
a) (x-1)-(2x+7) = 0
b) (x-1)(2x+7) = 0
aidée moi s'il vous plait, merci d'avance
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cavalier
a) (x-1)-(2x+7) = 0
x-1-2x-7=0
-x=7+1
-x = 8
x=-8
b) (x-1)(2x+7) = 0
2x² +7x-2x-7 =0
2x²+5x =7
2 votes
Thanks 0
Mbelgacem
a) (x-1)-(2x+7) = 0
x -1 -2x -7 = 0
x -2x = 7 + 1
-x = 8
x = -8
0 votes
Thanks 0
athe62
Pourquoi -x = 8 et x = -8?
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x-1-2x-7=0
-x=7+1
-x = 8
x=-8
b) (x-1)(2x+7) = 0
2x² +7x-2x-7 =0
2x²+5x =7
x -1 -2x -7 = 0
x -2x = 7 + 1
-x = 8
x = -8