### Instruction: Let the operation $\#$ be defined as $\#(a, b, c) = b^2 - 4ac$, for all real numbers $a, b$ and $c$. What is the value of $\#(1, 2, 3)$?### Response: To find the value of $\#(1, 2, 3)$, I need to plug in $a = 1$, $b = 2$, and $c = 3$ into the definition of $\#$ and simplify.