Home
Class 7
MATHS
If 2y + (1)/(2y) = l and 2y - (1)/(2y) =...

If `2y + (1)/(2y) = l` and `2y - (1)/(2y) = m` , then `l^(2) - m^(2) = "______"`.

A

2

B

4

C

6

D

0

Text Solution

Verified by Experts

The correct Answer is:
A, B
Promotional Banner

Topper's Solved these Questions

  • EXPRESSIONS AND SPECIAL PRODUCTS

    PEARSON IIT JEE FOUNDATION|Exercise CONCEPT APPLICATION (LEVEL 3) |25 Videos

  • EXPRESSIONS AND SPECIAL PRODUCTS

    PEARSON IIT JEE FOUNDATION|Exercise TEST YOUR CONCEPTS (ESSAY TYPE QUESIONS) |13 Videos

  • EQUATIONS AND THEIR APPLICATIONS

    PEARSON IIT JEE FOUNDATION|Exercise Level 3|23 Videos

  • FORMULAE

    PEARSON IIT JEE FOUNDATION|Exercise TEST 2|11 Videos

Similar Questions

Explore conceptually related problems

l and m are the lengths of the tangents from the origin and the point (9, -1) to the circle x^(2) + y^(2) + 18x - 2y + 32 = 0 The value of 17(l^(2) + m^(2)) is equal to ________ .

If line L:x/1 = y/2 =z/3 and plane E:x-2y +z=6 , then the line L

Curve b^(2)x^(2) + a^(2)y^(2) = a^(2)b^(2) and m^(2)x^(2)- y^(2)l^(2) = l^(2)m^(2) intersect each other at right-angle if:

For natural numbers m, n if (1-y)^(m)(1+y)^(n) = 1+a_(1)y+a_(2)y^(2) + "……." and a_(1) = a_(2) = 10 , then (m,n) is :

Consider the lines L _ 1 : ( x - 1 )/ ( 3 ) = ( y + 2 ) / ( 1 ) = ( z + 1 ) / ( 2 ) L _ 2 : ( x - 2) / ( 1 ) = ( y + 2 ) / ( 2 ) = ( z - 3 )/ ( 3 ) The unit vector perpendicular to both L _ 1 and L_ 2 is

For the natural number m, n, if ( 1- y ) ^(m) (1 + y) ^( n) =1 + a _(1) y + a _(2) y ^(2) + ...+ a _( m + n) y ^( m +n) and a _(1) = a _(2) = 10, then the value of (m+n) is equal to :

Two tangents to an ellispse x^(2)+2y^(2)=2 are drawn which intersect at right angles,let l_(1) and l_(2) be the intercepts on these tangents made by the circle x^(2)+y^(2)=2 , then l_(1)^(2)+l_(2)^(2) is equal to________

If the curves (x^(2))/(l^(2))+(y^(2))/(m^(2))=1 and (x^(2))/(64)+(y^(2))/(25)=1 cut each other orthogonally then l^(2)-m^(2)

If the line (x)/(l)+(y)/(m)=1 touches the parabola y^(2)=4a(x+b) then m^(2)(l+b)=