4x2y + 2xy - 6 + 5x2y - 8xy + 13

What signals you that factoring by grouping is the best method to use when factoring a problem?

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

Aperpendicular bisector, cd is drawn through point con ab if the coordinates of point a are (-3, 2) and the coordinates of point b are (7,6), the x-intercept of cd is point lies on cd.