Answers

2014-02-25T12:15:24+05:30
12x2-4x-21
=12x2-18x+14x-21
=6x(2x-3)+7(2x-3)
=(2x-3)(6x+7)
so  x=2/3  or   x=7/6
0
sorry x=3/2 0r x=-7/6
yeah you are right i forgot to multiply 12 with 21......thank you.