Die korrekte Antwort lautet:
3 ⋅ 6 = 18

$(18-\left(44+28\right))·2$

= $\left(18-44-28\right)·2$

= $-54·2$

= $-108$

$3\cdot {\left(-2\right)}^2-{\left(-3\right)}^2$

= $3\cdot 4-9$

= $12-9$

= $3$