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23-11-2016
Mathematics

contestada

solve by completing the square :

x^2-6x-11=0

Respuesta :

23-11-2016

x^2-6×+9-9-11=0
(×-3)^2-20=0
(×-3-4.5)(×-3+4.5)
(×-7.5)(×+1.5)=0

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