If \[f(x)=\left\{ \begin{matrix} {{e}^{{{x}^{2}}+x}}\,\,\,\,\,x>0 \\ ax+b,\,\,x\le 0 \\ \end{matrix} \right.\]is differentiable at x=0, then

If \[f(x)=\left\{ \begin{matrix} {{e}^{{{x}^{2}}+x}}\,\,\,\,\,x>0

1.	If \[f(x)=\left\{ \begin{matrix} {{e}^{{{x}^{2}}+x}}\,\,\,\,\,x>0 \\ ax+b,\,\,x\le 0 \\ \end{matrix} \right.\]is differentiable at x=0, then
A.	\[a=1,\text{ }b=-\,1\]
B.	\[a=-1,\text{ }b=1\]
C.	\[a=1,\text{ }b=1\]
D.	\[a=-\,1,\text{ }b=-\,1\]
Answer» D. \[a=-\,1,\text{ }b=-\,1\]

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If \[f(x)=\left\{ \begin{matrix} {{e}^{{{x}^{2}}+x}}\,\,\,\,\,x>0 \\ ax+b,\,\,x\le 0 \\ \end{matrix} \right.\]is differentiable at x=0, then

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