Answers

2016-06-28T14:37:14+08:00
3s²-6s+9= 03s²-6s+9= 0
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       3
s²-2s+3= 0
s²-2s= -3
s²-2s+1= -3+1
(s-1)² = -2
 \sqrt{(s- 1)^{2} } = \sqrt{-2} 

s-1= positive or negative  \sqrt{-2}
s=  \sqrt{-2} +1
s=- \sqrt{-2} +1
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