A) \[\left( {{x}^{2}}+3 \right)\left( {{x}^{2}}+3 \right)\]
B) \[\left( {{x}^{2}}+3 \right)\left( {{x}^{2}}-3 \right)\]
C) \[\left( {{x}^{2}}+2x+3 \right)\,\left( {{x}^{2}}-3x+3 \right)\]
D) Does not exist
Correct Answer: D
Solution :
\[{{x}^{4}}\]is always positive for all values of x. \[\therefore \]\[{{x}^{4}}+9\]is also always positive and never zero.
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