i get confused in polynomials .while using identities. i dont understand which identity to be used while factorisation.

Hi, 
Start with the examples provided in the text book after going through the study material and videos and try to observe how the formulas have been applied and then solve as many query as you can and post the problem on ask n ans so that  we can help you appropriately  

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this is based on the form of question which type of identity can be used in in the several types of question
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