Abdullah Qureshi Messages 16 Reaction score 0 Thread starter Mar 2, 2021 #1 Explain why x2 +1 is not a difference of squares and x2 -1 is
skeeter Messages 1,103 Reaction score 1 Mar 2, 2021 #2 Oh, but it is ... $x^2+1 = x^2 - (-1) = (x - i)(x + i)$