The function $f$ is defined by the formula
$\qquad f(x) =
\begin{cases}
bx-4 &\text{if $x<-1$}\\
ax^2+b &\text{if $-1\leq x \leq 2$}\\
ax+1 &\text{if $x> 2$}
\end{cases}$
**What values of $a$ and $b$ make $f$ continuous?**
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