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Question

The value of 25x2+16y2+40xy at x=1 and y=1 is

A
81
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B
-49
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C
1
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D
none of these
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Solution

The correct option is D 1
The value of 25x2+16y2+40xy at x=1 and y=1 is
25(1)2+16(1)2+40(1)(1)
25+1640
1
Option C is correct.

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