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AlpYuki2SYds4idroR AlpYuki2SYds4idroR
  • 27-01-2017
  • Mathematics
Answered

What numbers add up to 2 and multiply to get -15?

Verified Answer :

wolf1728
wolf1728 wolf1728
  • 27-01-2017

Set up 2 equations
A) x + y = 2
B) x y =-15
We can  change equation B into x = -15/y and substitute this into equation A

-15/y + y = 2

-15 + y^2 = 2y

y^2  -2y  -15 =0
Factoring
(y +3)
(y-5) = 0

y = -3 and y =5
Then solve for x

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