A) \[({{a}^{2}}+2a-2)({{a}^{2}}+2a+2)\]
B) \[({{a}^{2}}-2a-2)({{a}^{2}}+2a-2)\]
C) \[({{a}^{2}}+2a-2)({{a}^{2}}-2a+2)\]
D) \[({{a}^{2}}+2a+2)({{a}^{2}}-2a+2)\]
Correct Answer: D
Solution :
\[{{a}^{4}}+4\] \[={{a}^{4}}+4{{a}^{2}}-4{{a}^{2}}+4\] \[=({{a}^{2}}+2a+2)({{a}^{2}}-2a+2)\]
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