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

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

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User MartinC
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1 Answer

3 votes
Plug in 3 for x and solve for k.
(3)^2-3k+21=0
3k=9+21
3k=30
k=10
answered
User Olimpiu POP
by
7.5k points
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