1.

What is the factor form of \[9{{x}^{4}}-40{{x}^{2}}+16\]?

A. \[(x+1)\,(x-1)\,(2x+1)\,(2x-1)\]
B. \[(2x-1)\,(4{{x}^{2}}+2x+1)\]
C. \[(x+2)\,(2x-3)(x-1)\,(2x+3)\]
D. \[(x+2)\,(x-2)\,(3x+2)\,(3x-2)\]
Answer» E.


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