1.

Simplify : \[\left( 4x+5y \right)\left( 4x-5y \right)\]

A.  \[16{{x}^{2}}-25xy\]   
B.  \[16{{x}^{2}}-5{{y}^{2}}\]
C.  \[16{{x}^{2}}-5{{y}^{2}}\]
D.  \[16{{x}^{2}}-{{y}^{2}}\]
Answer» D.  \[16{{x}^{2}}-{{y}^{2}}\]


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