We have,
14x2 + 11xy – 15y2
The coefficient of x2 is 14
The coefficient of x is 11y
Constant term is -15y2
So, we express the middle term 11xy as 21xy – 10xy
14x2 + 11xy- 15y2 = 14x2 + 21xy – 10xy – 15y2
= 2x (7x – 5y) + 3y (7x – 5y)
= (2x + 3y) (7x – 5y)
