But can we use this method in our cbse board examination??

If not, then why should we learn this method??

it is for rough work

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we do not even have time to attend all the questions then do u think that we should do rough work for checking the answer and that too for QUADRATIC EQUATIONS?

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Better don't try this method for 'find the solution q's'.For such q use the method specified in the  text book.Use these methods only for some  worthy qs.

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you can do it as rough work

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What are you looking for?