Question

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

Answer 1

first we will open the bracket
= a+ b+c-d+a-b+c+d+2+ac+bd
now we will get the like teams together
=a+a+b-b+c+c-d+d+ac+bd
=2a+2c+ac+bd+2

Answer 2

ac -ad +bc-bd + ac+ad -bc-bd +2ac +2bd
ac-ad +bc-bd + ac+ad -bc-bd+ac+ac+bd+bd
ac+ac+ac+ac
=4ac