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2014-05-20T12:49:26-03:00
X= (-b+/-√b²-4ac)/2a
x= (-0+/-√0²-4.2.(-18))/2.2
x= +/-√144/4
x=+/-12/4
x=+3
x=-3
2 4 2
2014-05-20T14:09:25-03:00
2x²-18=0
2x²=18
x²=18÷2
x²=9
x=±√9
x=±3