Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
AP EAMCET202124 Aug 2021Evening ShiftMathematicsStraight LinesActual

Find the transformed equation of the curve x^2+2 3 x y-y^2=8 , when the axes are rotated through an angle 3 .

Options

  1. Ax^2+y^2+2 3 x y=8
  2. Bx^2+y^2-2 3 x y=8
  3. Cx^2-y^2+2 3 x y=8
  4. Dx^2-y^2-2 3 x y=8

Correct answer

D. x^2-y^2-2 3 x y=8

Step-by-step solution

Given equation, x^2+2 3 x y-y^2=8 Since, the axes are rotated through an angle / 3 . (x, y) replaced by (x 3 -y 3 , x 3 +y 3 ) i.e. ( x- 3 y 2 , 3 x+y 2 ) in the given equation. ( x- 3 y 2 )^2+2 3 ( x- 3 y 2 ) ( 3 x+y 2 )- ( 3 x+y 2 )^2=8 aligned 1 4 (x^2-2 3 x y . & +3 y^2+6 x^2-4 3 x y & .-6 y^2-3 x^2-2 3 x-y^2 )=8 aligned 1 4 (4 x^2-8 3 x y-4 y^2 )=8 x^2-2 3 x y-y^2=8

Practice Straight Lines on Quantrex Academy →

More from Straight Lines

The locus of the third vertex of a right-angled triangle, the ends of whose hypotenuse are (1,2) and (4,5) , is 2025The coordinate axes are rotated about the origin in the counter clockwise direction through an angle 60^ . If a and b are the intercepts made on the new axes by a straight line who 2025The image of a point (2,-1) with respect to the line x-y+1=0 is 2025If a straight line is at a distance of 10 units from the origin and the perpendicular drawn from the origin to it makes an angle 4 with the negative X -axis in the negative directi 2025A straight line passing through the origin O meets the parallel lines 4 x+2 y=9 and 2 x + y +6=0 at the points P and Q respectively. Then the point O divides the line segment PQ in 2025A (4,3), B (2,5) are two points. If P is a variable point on the same side as that of the origin with respect to the line AB and is at most at a distance of 5 units from the midpoi 2025By shifting the origin to the point (2,3) through translation of axes, if the equation of the curve x^2+3 x y-2 y^2+4 x-y-20=0 is transformed to the form Ax ^2+ Bxy + Cy ^2+ Dx + E 2025The points (2,3) and (-4,- 4 3 ) lie on the opposite sides of the line L 5 x -6 y + k =0 and k is an integer. If the points (1,2) and (4,5) lie on the same side of the line L =0 , 2025 Full Straight Lines list All AP EAMCET PYQs