MHB Why x2 +1 and x2 -1 are Not/Are Difference of Squares

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Abdullah Qureshi
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Explain why x2 +1 is not a difference of squares and x2 -1 is
 
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Oh, but it is ...

$x^2+1 = x^2 - (-1) = (x - i)(x + i)$
 
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