Answer
$h= 0$ and $k= 0$
Work Step by Step
Given $$\begin{aligned}
f(x) &= a(x-h)^2+ k.
\end{aligned}$$ The vertex of a parabola is $(h,k)$. For the origin to be the vertex we must have $$(h,k)=(0,0)\implies h= 0, k= 0.$$
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