Question

(a+b) (c-d) + (a-b) (c+d) +2 (ac+bd)​

Answer 1

Question:

(a+b) (c-d) + (a-b) (c+d) +2 (ac+bd)

Answer:

(a+b) (c-d) + (a-b) (c+d) +2 (ac+bd)

= a(c-d) +b(c-d)+a(c+d)-b(c+d)+2ac+2bd

= ac-ad+bc-bd+ac+ad-bc-bd+2ac+2bd

= 2ac-2bd+2ac+2bd

= 0

Final answer: 0