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How do you factor #x^2 + 9 #?

1 Answer

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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