Réponses

2013-12-11T21:25:04+01:00
6x²-3=21
6x²-3-21=0
6x²-24=0
6x²=24
x²=24/6
x²=4
x=√4=2


-2x²-7=-5+7x²
-2x²-7+5-7x²=0
-9x²-2=0
-9x²=2
x²=2/-9
x=√2/-9

x²+3=-6
x²+3+6=0
x²+9=0
x²=-9
x=√-9