(a+b+c)(b+c-a)(c+a-b)(a+b-c)
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Hey dear!
Here is yr answer....
=> (a+b+c) (b+c-a) (c+a-b) (a+b-c)
=> ab+ac-a²+ac+a²-ab+a²+ab-ac+b²+bc-ab+bc+ab-b²+ab+b²-bc+bc+c²-ac+c²+ac-bc+ac+bc-c²
=> 4ab-2ab+4ac-2ac+2a²-a²+2b²-b²+4bc-2bc+2c²-c²
=> 2ab+2ac+a²+b²+2bc+c²
=> a²+b²+c²+2ab+2bc+2ac
=> (a+b+c)²
Hope it hlpz....
Here is yr answer....
=> (a+b+c) (b+c-a) (c+a-b) (a+b-c)
=> ab+ac-a²+ac+a²-ab+a²+ab-ac+b²+bc-ab+bc+ab-b²+ab+b²-bc+bc+c²-ac+c²+ac-bc+ac+bc-c²
=> 4ab-2ab+4ac-2ac+2a²-a²+2b²-b²+4bc-2bc+2c²-c²
=> 2ab+2ac+a²+b²+2bc+c²
=> a²+b²+c²+2ab+2bc+2ac
=> (a+b+c)²
Hope it hlpz....
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