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If y=(a x-b)/((x-1)(x-4)) has a turning ...

If `y=(a x-b)/((x-1)(x-4))` has a turning point `P(2,\ -1)` , find the values of `a` and `b` and show that `y` is maximum at `P` .

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The correct Answer is:
` a = 1, b =0`
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