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Sterling
Mathematics
11 September, 14:46
What adds up to - 2 and multiplies to - 80
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Marilyn Berg
11 September, 14:54
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X + y = - 2
xy = - 80
x (-2 - x) = - 80
x^2 + 2x - 80 = 0
(x + 10) (x - 8) = 0
Solutions:
x = 8, y = - 10
x = - 10, y = 8
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