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what adds to be 7 but multiply to be -8

 Dec 1, 2020

Best Answer 

 #1
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x+y = 7     y = 7-x

xy = -8      sub in above equation

 

x (7-x) = -8

7x - x^2 + 8 = 0      Quadratic formula   x and y  =   -1   and 8  

 Dec 1, 2020
 #1
avatar
+1
Best Answer

x+y = 7     y = 7-x

xy = -8      sub in above equation

 

x (7-x) = -8

7x - x^2 + 8 = 0      Quadratic formula   x and y  =   -1   and 8  

Guest Dec 1, 2020

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