Final answer to the problem
$-5$
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1
Apply the formula: $ab$$=ab$, where $ab=- -4$, $a=-1$ and $b=-4$
$-9+4$
2
Apply the formula: $a+b$$=a+b$, where $a=4$, $b=-9$ and $a+b=-9+4$
$-5$
Final answer to the problem
$-5$
