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Q.

If xy(x – y) = 2a3(a > 0) then y has minimum when x =

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a

1a

b

-a

c

a2

d

a

answer is A.

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Detailed Solution

xyx-y=2a3a>0

Apply diff. on both sides

x2dy/dx+2xy-1y2-x2ydy/dx=0

y is minimum or maximum

dy/dx=0 2xy-y2=02x=y xyx-y=2a3 put y=2x x2xx-2x=2a3 2x2-x=2a3 x3=-a3 x=-a

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