Maths-
General
Easy
Question
The condition that the equation can take the form when shifting the origin is
Hint:
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:
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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