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List numbers that multiply to make 28 and find their sums. Since negative times a negative is positive, list the negatives.

-1, -28 = -29

-2, -14 = -15

-4, -7 = -11

Aha! -4 and -7 multiply to make 28 and add to -11; therefore, -4 and -7 are the two numbers.

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Q: What two numbers add to make negative eleven and multiply to make 28?
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