Maths-
General
Easy

Question

The condition that the equation a x to the power of 2 end exponent plus 2 h x y plus b y to the power of 2 end exponent plus 2 g x plus 2 f y plus c equals 0 can take the form a x squared plus 2 h x y plus b y squared equals 0 when shifting the origin is

  1. a b c plus 2 f g h minus a f to the power of 2 end exponent minus b g to the power of 2 end exponent minus c h to the power of 2 end exponent equals 0    
  2. 2 f g h minus b g to the power of 2 end exponent minus c h to the power of 2 end exponent equals 0    
  3. 2 f g h minus a f to the power of 2 end exponent minus c h to the power of 2 end exponent equals 0    
  4. 2 f g h minus a f to the power of 2 end exponent minus b g to the power of 2 end exponent equals 0    

hintHint:

solve for the quadratic equation in x and then apply D=0 to find the equal roots. Then solve for the resultant quadratic equation in y and solve for the equal and real roots.

The correct answer is: a b c plus 2 f g h minus a f to the power of 2 end exponent minus b g to the power of 2 end exponent minus c h to the power of 2 end exponent equals 0



    abc + 2fgh -af2-bg2-ch2=0


    In the first equation, if we apply the formula to find the roots, we get
    X=(-2(hy+g)±√(4(hy+g)2-4a(by2+2fy+c))/2
    For a linear relationship between x and y, D=0
    Hence,
    4(hy+g2)-4a(by2+2fy+c)=0
    This is a quadratic in y, whose D=0 since the roots are equal
    abc + 2fgh -af2-bg2-ch2=0

    When the roots are equal and real, then the discriminant value of the the quadratic equation becomes 0.

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