The Total solution for NCERT class 6-12
(x + 2) (x2 + 25) – 10x2 – 20x= (x + 2) (x2 + 25) – 10x(x + 2)= (x + 2) [x2 + 25 – 10x]= (x + 2) [(x)2 – 2 x x x 5 + (5)2]= (x + 2) (x – 5)2