Answers

2016-07-13T23:55:07+08:00
4s^2+9=12s
4s^2-12s+9=0
(2s-3)(2s-3)=0
2s-3=0 ; 2s-3=0
2s=3 ;2s=3
2s/2=3/2 ; 2s/2=3/2
s=3/2 ; s=3/2
-hope it helped you.
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