Hello!! Today my maths teacher ask a question to all student in class. that was Code (Text): f:R-->R f(x) = (a*x[SUP]2[/SUP]+6x-8) / (a+6x-8*x[SUP]2[/SUP]) f is onto then find the value of [b]a[/b] after 10 minutes some students answer. every body was wrong. this question was also answered wrong in many Indian writer's books for many years. Now my teacher tell where we all students were wrong and know i know the correct answer. I just want to show this question to all those persons who love mathematical beauty.I am not intended to get answer for homework help. So guys try it. Please don't answer this if you already know this questions truth.