Question

(a+b)2 - (a-b)2=4ab​

Answer 1

solve LHS RHS separately

Answer 2

(a+b)2-(a-b)2 = a2+b2+2ab - (a2+b2-

2ab)

= a2+b2+2ab-a2-b2+2ab

= 2ab +2ab

= 4ab

= RHS

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