Réponses

2013-01-28T15:24:51+01:00

 

x²-100=0

x² = 100

donc x = √100 = 10

 

x²+25=0

x² = - 25

Pas de solution car - 25 < 0

 

x²- 9/6 =0

x² = 9/6 = 3/2

x = √(3/2)

 

4x²=36

x²=36/4

x²=9

x = √9

x = 3

 

7x²=49

x²=49/7

x²=7

x = √7

 

6x²=96

x²=96/6

x²=16

x = √16

x = 4

 

-2x²=24

x²= - 12

Pas de solution car - 12 < 0

2013-01-28T16:17:21+01:00

x²-100=0

x² = 100

donc x = √100 = 10

 

x²+25=0

x² = - 25

Pas de solution car - 25 < 0

 

x²- 9/6 =0

x² = 9/6 = 3/2

x = √(3/2)

 

4x²=36

x²=36/4

x²=9

x = √9

x = 3

 

7x²=49

x²=49/7

x²=7

x = √7

 

6x²=96

x²=96/6

x²=16

x = √16

x = 4

 

-2x²=24

x²= - 12

Pas de solution car - 12 < 0