<|system|>
The expression $6y^2-y-51$ can be rewritten as $(3Ay+B)(y-C)$, where $A$, $B$, and $C$ are positive integers. Find $(AC)^2-B$.</s>.
<|user|>
Can you answer based on context?
<|assistant|>
The expression $6y^2-y-51$ can be rewritten as $(6y+17)(y-3)$. Therefore, $A=2$, $B=17$, and $C=3$. Thus, $(AC)^2-B=(2\times3)^2-17=19$.