Why is (n-1)(n+1)=n^2-1?
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The basic answer is that you cross-multiply the values in each factor: (n - 1)(n + 1) n^2 - n + n -...
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The basic answer is that you cross-multiply the values in each factor: (n - 1)(n + 1) n^2 - n + n -...
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This answer is compulsory for you to read no matter what you are. If you are a teenager read this an...
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