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Q.

Shift the origin to a suitable point so that the equation y2 + 4y + 8x2 = 0 will not contain y, constant terms is

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a

(3/4,–2)

b

(3/4,2)

c

(2, 3/4)

d

(2, –3/4)

answer is A.

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Detailed Solution

detailed_solution_thumbnail

Given equation y2+4y+8x-2=0 let (h,k) be origin shifted to the point then x=X+h, y=Y+k Now transformed equation is (Y+k)2+4(Y+k)+8(X+h)-2=0 Y2+k2+2kY+4Y+4k+8X+8h-2=0 y2+(2k+4)y+8x+8h+4k+k2-2=0 If it not contains y and constant terms then 2k+4=0 2k=-4 k=-2 and 8h+4k+k2-2=0 8h+4(-2)+(-2)2-2=0 8h-8+4-2=0 8h=6 h=68=34 Required point=34,-2 

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