Determine if x^2+4 is a difference of 2 squares, if so, factor it?

1 Answer
bp
Jun 12, 2018

(x-2i)(x+2i)

Explanation:

If it is a difference of two squares, it can expressed as product of two factors. Like #p^2 -q^2# is a difference of two squares and its factors are (p-q) and (p+q).

In other words the problem is to factorise #x^2 +4# the factors are obviously (x-2i) and (x+2i)
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