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20-11-2018
Mathematics

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Find k such that (x+2) is a factor of (x^3-kx^2+3x+7k)

Respuesta :

20-11-2018

x+2 =0
x= -2

subs x= -2 in the equation

(-2)^3 - k(-2)^2 +3(-2) +7k = 0
-8 - 4k - 6 +7k =0
3k = 14
k= 14/3

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