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`        from a pointA (1,1),straight lines AL and AM are drawn at right angles to the pair of straight lines 3x2+7xy-2y2=0...then combined equation of AL and AM is............`
7 years ago

147 Points
```										Dear shivanshi
3x2+7xy-2y2=0
m1 + m2 = 7/2
m1.m2 =-3/2

now let a line  a'(x-1)2 + 2h'(x-1)(y-1) + b'(y-1)2 =0   whose line is perpendicular to the these lines
m3 = -1/m1
m4 = -1/m2

m3 + m4 = -(m1+m2)/m1m2
-2h'/b'         = 7/3
m3.m4  = -1/m1m1
a'/b'     = -2/3

a'(x-1)2 + 2h'(x-1)(y-1) + b'(y-1)2 =0
or
a'/b' (x-1)2 + 2h'/b' (x-1)(y-1) + (y-1)2 =0
- 2/3  (x-1)2 -7/3 (x-1)(y-1) + (y-1)2 =0
or
2 (x-1)2 +7 (x-1)(y-1) +3 (y-1)2 =0
Please feel free to post as many doubts on our discussion forum as you can.If you find any question Difficult to understand - post it here and we will get you the answer and detailed solution very  quickly. We are all IITians and here to help you in your IIT JEE  & AIEEE preparation. All the best. Regards,Askiitians ExpertsBadiuddin

```
7 years ago
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