Answer
$-9$
Work Step by Step
We start with the given expression: $bc-3a^2$
We plug in values for $a$, $b$, and $c$: $3(-2)-3(-1)^2$
We simplify according to the order of operations:
First, we simplify powers: $3(-2)-3(1)$
Then, we multiply from left to right: $-6-3$
Finally, we subtract: $-9$
