If f(x)=Ax^(2)+Bx+C and A ne 0 then find...

If `f(x)=Ax^(2)+Bx+C` and `A ne 0` then find the value of `theta` in Lagrange's mean value theorem,
`f(x+h)=f(x)+h f'(x+theta h)`.

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The correct Answer is:

`theta` is `(1)/(2)`

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