The Total solution for NCERT class 6-12
(i) (5 – 2x) (3 + x)
= 5 (3 + x) – 2x (3 + x)
=15 + 5x – 6x – 2x2
= 15 – x -2 x 2
(ii) (x + 7y) (7x – y)
= x(7x-y) + 7y ( 7x-y)
=7x2 –xy + 49xy – 7y2
= 7x2 –7y2 +48xy
iii) (a2+ b) (a+ b2)
= a2 (a + b2) + b(a+ b2)
= a3 + a2b2 +ab + b3
= a3 + b3 + a2b2 + ab
iv) (p2– q2) (2p + q)
= p2 (2p + q)– q2 (2p+ q)
=2p3 + p2q – 2pq2 – q3
= 2p3 – q3 + p2q – 2pq2