Finding the domain and range of the a Relation

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i have this question

Let $A=\{1,2,3,4\}$, $B=\{1,4,6,8,9\}$ and $aRb \iff b=a^2$. Find the domain, range of the relation $R$.

My answer is Domain=(1,2,3) Range=(1,4,9).Is this correct?