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  • 16-01-2017
  • Mathematics
contestada

what two numbers multiplied together equal -420, but added together equal 1

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col08
col08 col08
  • 16-01-2017
-21 x 20 multiplied together equal -420 but added together equals 1
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texaschic101
texaschic101 texaschic101
  • 16-01-2017
 x * y = -420
x + y = 1.....x = 1 - y

y(1 - y) = -420
-y^2 + y = -420
y^2 - y - 420 = 0
(y + 20)(y - 21) = 0

y + 20 = 0       x + y = 1
y = -20            x - 20 = 1
                       x = 21

y - 21 = 0      x + y = 1
y = 21           x + 21 = 1
                     x = -20

ur 2 numbers are 21 and -20

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