Answers

2016-06-26T14:03:25+08:00
6r^2+18r=0 6r^2+18r-0=0 a=6 b=18 c=0
0
2016-06-26T14:05:20+08:00
6r²₊18r=0
÷
6
= r²=3r
=√r²=√3r
= r=₊₋√3r
0