The value of \[25{{x}^{2}}+16{{y}^{2}}+40xy\] at \[x=1\] and \[y=-1\]is

The value of \[25{{x}^{2}}+16{{y}^{2}}+40xy\] at \[x=1\] and \[y=-1\]i

1.	The value of \[25{{x}^{2}}+16{{y}^{2}}+40xy\] at \[x=1\] and \[y=-1\]is
A.	81
B.	\[-49\]
C.	1
D.	None of these
Answer» D. None of these

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The value of \[25{{x}^{2}}+16{{y}^{2}}+40xy\] at \[x=1\] and \[y=-1\]is

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