Answer
$b=\{ -9, 9, -3, 3 \}$
Work Step by Step
The factors of $-10$ are $
\{1,-10\}, \{-1,10\}, \{2,-5\}, \{-2,5\}.
$ Getting the sum of these factors, then $
b=\{ -9, 9, -3, 3 \}
$.
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