Given the function $$f(x)= \left\{ \begin{array}{rcl} -3 x^2 + 2 & {\rm if } & x<1 \cr -6 x^2 + 2 & {\rm if} & x\geq 1 \end{array} \right.$$ Calculate the following values:
$f(-2)=$
$f(1)=$
$f(2)=$