6plz answer
If a,b,c are in G.P with common ration r,the sum of the ordinates of the points of intersection of line ax+by+c=0 and the curve x+2y2=0 is
(a)-r2/2
(b)-r/2
(c)r/2
(d)r2/2
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5 Answers
1let a' b c be a/r a ar
so nw
intersction o fline n curve is a'2y^2-by-c=0
sum of d ordinates
ie roots is
y1+y2= b/2a'
b/2a' =a/2(a/r) =r/2
bt wat we need is engative of thsis so answer is c /......ie r/2
cheero~
11let
b = ar
c = ar2
THerefore
x + ry + r2 = 0
x = - 2 y2
-2y2 + ry + r2 = 0
Σy = -b/a
Σy = -r/(-2r)
Σy = r/2
There fore option c
1c post 1#
i did a silly mistake i mean i tookk x =2Y2 instead of -2Y2
:( nw edited