Q.
The area enclosed by the curve whose equation is given by y2+2xy+40x=400is
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a
400
b
800
c
600
d
200
answer is B.
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Detailed Solution
x≥0the equation is y+20y+2x-20=0.For x≤0,the equation is y-20y+2x-20=0Area 20×40=800
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