815
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You're probably looking for -49 and -18 which, although they do have a product of 882, are not considered factors of it. -49 and -18 are factors of -882.
67
The factors of 21 that add up to 8 are 1 and 7.
Here is a list.All Factors of 882:1, 2, 3, 6, 7, 9, 14, 18, 21, 42, 49, 63, 98, 126, 147, 294, 441, 882
I suppose you could use -42 twice. -63 and -21
factors of 30 that add to 17 are 2 and 15