marqel24 marqel24

21-02-2017
Mathematics

contestada

Find the value of "k", given that one solution of the equation x2-kx+21=0 is 3

Respuesta :

corajune99 corajune99

21-02-2017

Plug in 3 for x and solve for k.
(3)^2-3k+21=0
3k=9+21
3k=30
k=10

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