Final answer to the problem
$8$
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1
Apply the formula: $ab$$=ab$, where $ab=- 2\cdot -4$, $a=-1$ and $b=2$
$-2\cdot -4$
2
Apply the formula: $ab$$=ab$, where $ab=-2\cdot -4$, $a=-2$ and $b=-4$
$8$
Final answer to the problem
$8$
