Simplify
1. (a + b ) ( c - d ) + ( a - b) ( c + d )+2 (ac +bd)
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ac-ad+bc-bd+ac+ad-bc-bd+2ac+2bd
-2bd+2ac+2bd
2ac
hope it helps..........
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-2bc+2ac+2bd
4ac