SOLUTION: why is {{{x^2+144}}} not factorable according to cliff notes?

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Question 747660: why is x%5E2%2B144 not factorable according to cliff notes?
Answer by FrankM(1040) About Me  (Show Source):
You can put this solution on YOUR website!
Because x^2 would need to be -144. The square of any real number is positive.
X can be 12i where i is the square root of -1. This is a solution, but not a real one.