Question

13. (a + b) (c – d) + (a - b) (c + d) + 2 (ac + bd)
​

Answer 1

Answer:

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

4ac

hope this helpsss u!!

Answer 2

(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

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

2ac+2ac-2bd+2bd

4ac