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X2 + 1 ????
X2 + 1
Can not be factored in real numbers but there is a clever way to factor this expression in complex numbers.
(X + i)(X - i)
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yes
x2=1
if you square root both sides you get x = +-1 or, using the difference of 2 perfect squares,
(x-1)(x+1)=0
If you mean: x2+3x+2 then it is (x+1)(x+2) when factored
That expression can not be factored.
x2+16x-17 = (x-1)(x+17) when factored
x2-7x+6 = (x-1)(x-6) when factored.
x3 - x2 + 2x = x*(x2 - x + 2) which cannot be factored further.