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in 3D Coordinate Geometry by (10.6k points)

दो रेखाओं की दिक्-कोज्याएँ निम्न सम्बन्धों द्वारा दी गई है, उन्हें ज्ञात कीजिए। l – 5m + 3n = 0 तथा 7l2 + 5m2 – 3n2 = 0

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l – 5m + 3n = 0 तथा 7l2 + 5m2 – 3n2 = 0
दिया है

l – 5m + 3n = 0 …(1)

7l2 + 5m2– 3n2 = 0 …(2)

समीकरण (1) से, l = 5m – 3n को समीकरण (2) में रखने पर,

7(5m – 3n)2 + 5m2 – 3n2 = 0

7(25m2 + 9n2 – 30mn) + 5m2 – 3n2 = 0

175m2+ 63n2 – 210mn + 5m2 – 3n2 = 0

180m2 – 210mn + 60m2 = 0

6m2– 7mn + 2n2 = 0

6m2 – 4mn – 3mn + 2n2 = 0

2m(3m – 2n) – n(3m – 2n) = 0

(3m – 2n)(2m – n) = 0

3m = 2n और 2m = n

दो रेखाओं की दिक्-कोज्याएँ

दो रेखाओं की दिक्-कोज्याएँ

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