
Bill L. answered 01/15/13
Patient and works well with students.
12x^2 -22x -20
begin by factoring out the common factor for all three terms (2):
2(6x^2 -11x -10)
Rewrite the middle term as:
2(6x^2 +4X-15X -10)
group terms:
2((6x^2 +4X)- (15X + 10))
2(2x(3x +2)- 5(3X + 2))
2(3X + 2)(2x- 5)