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-22

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Jennie Konopelski

Lvl 10
3y ago
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Wiki User

11y ago

The factor pairs of -21 are (21,-1)(7,-3)(-21,1)(-7,3)

None of them total negative one. I suppose you could use twenty ones and -21, but that's pretty ugly.

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Q: What multiplies to -21 that adds up to -1?
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