AP EAMCET201920 Apr 2019Evening ShiftMathematicsStraight LinesActual
If the origin is shifted to (2,3) and the axes are rotated through an angle 45^ about that point, then the transformed equation of 2 x^2+2 y^2-8 x-12 y+18=0 is
Options
- Ax^2-7 y^2-14 x y-2=0
- Bx^2+y^2=4
- Cx^2-y^2=4
- D8 x^2-2 y^2=9
Correct answer
B. x^2+y^2=4
Step-by-step solution
Given, equation is array rlrl & & 2 x^2+2 y^2-8 x-12 y+18 & =0 & 2(x-2)^2+2(y-3)^2 & =8 & (x-2)^2+(y-3)^2 & =4 array After the shifting of origin to (2,3) , the transformed equation becomes x^2+y^2=4 and after the rotation of axes through an angle 45^ about the point, the transformed equation is x^2+y^2=4 . Hence, option (b) is correct.