differentiation

Question: If $y=a\,\,\log x+b{{x}^{2}}+x$ has its extremum value at $x=1$ and $x=2,$ then $(a,b)$ =

1) $\left( 1,\,\,\frac{1}{2} \right)$

2) $\left( \frac{1}{2},\,2 \right)$

3) $\left( 2,\,\,\frac{-1}{2} \right)$

4) $\left( \frac{-2}{3},\,\,\frac{-1}{6} \right)$

Solution:

Explanation: No Explanation

Maxima and Minima

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