Answers

2014-07-16T20:34:21+08:00
3x^2-12x+36=-7+36

by completing the square
..
0
actually you cannot divide 12 by 2 and then squared it to get 36 before you can use this method you must first reduce the coefficient of x squared to 1 thus you should divide the whole equation by 3
2014-07-16T20:52:21+08:00
12+ square root of 15    and     12 - square root of 15           
             3                                                3
0