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```
If {a(x^2) + c}y + {a’(x^2) + c’} = 0 and x is a rational function of y and ac is negative,then 1)ac’ + a’c = 0 2)a/a’ = c/c’ 3)a^2 + c^2 = a’^2 + c’^2 4)aa’ + cc’ =1 Please explain the question..What does the question mean by x is a rational function of y??

```
2 years ago

```							rational function means a ratio of two polynomials. eg. (3x^3+x-1)/(x^3-7x) is a rational function.now, we can write the eqn as(ay+a’)x=root( –acy – y(a’c+ac’) – a’c’).......(1),but x=p(y)/f(y), p and f being polynomials.so we conclude that LHS of (1) is a rational function as well. which implies that RHS is a rational function too, which is possible iff –acy – y(a’c+ac’) – a’c’ is a perfect square, or discriminant is zero.so, (a’c+ac’)^2=4aca’c’or (a’c-ac’)^2=0or a’c=ac’or a/a’=c/c’
```
2 years ago
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