1.

Which of the following is the correct factorization?

A.  \[64-{{x}^{2}}=(64-x)\,(64+x)\]
B.  \[27{{x}^{2}}-48=3(3x+4)\,(3x-4)\]
C.  \[{{y}^{2}}-81=(y+9)\,(y+9)\]
D.  \[36-{{p}^{2}}=(p-6)\,(p+6)\]
Answer» C.  \[{{y}^{2}}-81=(y+9)\,(y+9)\]


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