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if 2y+x+3=0 touches the circle 5X^2 + 5y^2=k
then k= ?
x2+ y2 =k/5; centre is (0,0). and radius = root(k/5).
as line touches circle so distance of line from centre equals the radius,
3/root(22+12)= root(k/5)
solving, k= 9
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