Home
Class 14
MATHS
If l:m:n=1:2:4, then sqrt (5l^2+ m^2+n^2...

If l:m:n=1:2:4, then `sqrt (5l^2+ m^2+n^2)` is equal to :

A

4n

B

5l

C

2m

D

5

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Similar Questions

Explore conceptually related problems

If l, m, n denote the side of a pedal triangle, then (l)/(a ^(2))+(m)/(b^(2))+(n)/(c ^(2)) is equal to

If l, m n denote the lengths of the intercepts made by the circle x ^(2) +y ^(2) - 8x + 10y + 16 =0 on x-axis, y-axis and y = -x respectively, then l + m + n is equal to l + m + n (sqrt2 = 1.41)

ABCD is a square of length a, a in N, a > 1. Let L_1, L_2 , L_3... be points on BC such that BL_1 = L_1 L_2 = L_2 L_3 = .... 1 and M_1,M_2 , M_3,....be points on CD such that CM_1 = M_1M_2= M_2 M_3=... = 1. Then sum_(n = 1)^(a-1) ((AL_n)^2 + (L_n M_n)^2) is equal to :

If the direction cosines of two lines are (l_(1), m_(1), n_(1)) and (l_(2), m_(2), n_(2)) and the angle between them is theta then l_(1)^(2)+m_(1)^(2)+n_(1)^(2)=1=l_(2)^(2)+m_(2)^(2)+n_(2)^(2) and costheta = l_(1)l_(2)+m_(1)m_(2)+n_(1)n_(2) If l_(1)=1/sqrt(3), m_(1)=1/sqrt(3) then the value of n_(1) is equal to

Let P=[(2alpha),(5),(-3alpha^(2))] and Q=[(2l,-m,5n)] are two matrices, where l, m, n, alpha in R , then the value of determinant PQ is equal to

If one root of the equation lx^(2)+mx+n=0 is (9)/(2) equal to (l,m and n are positive integers) and (m)/(4n)=(l)/(m), then l+n is equal to

Write the greatest common factor in each of the term. l ^(2) m ^(2) n, l m ^(2) n ^(2) , l ^(2) mn ^(2)