My query is attached in the image above tell me that 2 is added but why it is not subtracted ? As we know that if we add something by ourselves then we have to subtract it too....read the question on the top of THE IMAGE I HAVE PROVIDED...PLZ DON'T SPAM I REQUEST YOU....
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The question is asking for the minimum number that must be added to make the given number into a binomial square. So, he added 2. Since the answer requires two, we can't subtract it.
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Refer this ATTACHMENT
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