the straight lines whose direction cosines given by al+bm+cn=0 and mn+nl+lm=0 are parallel if a^1/2+b^1/2-c^1/2 is equal to a) 0,b) 1,c)2,d)4

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Badiuddin askIITians.ismu Expert · Answer

Dear Vaibhav al+bm+cn=0....................1 mn+nl+lm=0......................2 put value of n from 1 to second and form the quadretic equation in (l/m) a(l/m) 2 +(a+b-c)(l/m) +b=0 so (l1/m1)*(l2/m2) =b/a ...............3 given line are parallel so l1/l2 =m1/m2 =n1/n2 or l1/m1 =l2/m2 so from equation 3 l1/m1 =(b/a) 1/2 and l1/m1 +l2/m2 =(c-a-b)/a or 2(l1/m1) =(c-a-b)/a from above result 2(b/a) 1/2 =(c-a-b)/a or a+b+ 2 (ba) 1/2 =c (a) 1/2 + (b) 1/2 =(c) 1/2 so option a is correct 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 Experts Badiuddin

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the straight lines whose direction cosines given by al+bm+cn=0 and mn+nl+lm=0 are parallel if a^1/2+b^1/2-c^1/2 is equal to a) 0,b) 1,c)2,d)4

the straight lines whose direction cosines given by al+bm+cn=0 and mn+nl+lm=0 are parallel if a^1/2+b^1/2-c^1/2 is equal to a) 0,b) 1,c)2,d)4

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