You can start by using the formula for the difference of two squares. Actually, after that I don't think you can factor it any further.
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-23
No. An expression such as b2 -16 does not normally have a distance associated with it.
It cannot factor without imaginary numbers
l a2 b2 is c2!!Its completely norma
as a2+b2=(a+ib)(a-ib), b2+2=[b - i sqrt(2)] [b + i sqrt(2)]