Question

(p + q) (r + s) + (p – q) (r – s) – 2 (pr + qs)​

Answer 1

Answer:

(p+q) (r+s) + (p-q) (r-s) -2 (pr + qs)

(pr + ps + qr + qs) + (pr - ps - qr + qs) + (- 2pr - 2qs)

pr + pr + qs + qs - 2pr - 2qs

2pr + 2qs - 2pr - 2as

2pr - 2pr + 2qs - 2qs

0

May your doubt be cleared by me....

Answer 2

May this is helpful for you :) l