Piyush Kumar Behera
Last Activity: 8 Years ago
There is a formula you can check it in any coordinate geometry book(such as s k goyal,etc)
which gives the joint equation of the pair of lines joining the origin and point of intersection of a curve and a straight line.
Joint equation of the lines joining the origin to the intersecting points of the y=mx+2 and the curve x2+y2=1
x2+y2=((y-mx)/2)2
=> x2(4-m2)+2mxy+3y2=0
Since this lines are at right angles,
=> 4-m2 +3=0=>m2=7
so the ans is (3) m2=7
I hope you have understood,and if you haven’t then please read the above mentioned topic.Please upvote my solution to encourage me.
