A) 81
B) \[-49\]
C) 1
D) None of these
Correct Answer: C
Solution :
\[25{{x}^{2}}+16{{y}^{2}}+40xy\] At\[x=1\]and\[y=-1\] \[25{{(1)}^{2}}+15{{(-1)}^{2}}+40(1)(-1)\] \[=25+16-40=1.\]You need to login to perform this action.
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