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842

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Araceli Harris

Lvl 10
3y ago
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Wiki User

11y ago

xy = 840

x+ y = -2

y = -2-x

x(-2-x) = 840

-2x -x^2 -840 = 0

x^2 +2x + 840 = 0

use quadratic formula:

X = -1-28.965i

Y = -1 +28.965i

i is imaginary and i squared -= -1

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Q: What two numbers multiply to get 840 and add up to negative 2?
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