If \(f(x)=\left{\begin{matrix}{e}^{x}+ax, & x

If \(f(x)=\left{\begin{matrix}{e}^{x}+ax, & x<0 \\ b{(x−1)}^{2}, & x\geq 0\end{matrix}\right.\)is differentiable at \(x=0\), then \((a,b)\) is