How do you factor x^2 + 9 ?

1 Answer
Alan P.
Jun 28, 2015

x^2+9 has no (Real) factors (Unlike x^2-9)

Explanation:

The most you could do with this is use the quadratic formula on
color(white)("XXXX")x^2+0*x+9
to get
color(white)("XXXX")+-3i

So you could factor using Complex values:
color(white)("XXXX")x^2+9 = (x+3i)(x-3i)

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