SOLUTION: If f(x)=x2-kx-3 and f(2)=9, then k =

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Question 1009523: If f(x)=x2-kx-3 and f(2)=9, then k =
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
For f(x) = x^2 - kx - 3 and f(2) = 9, we can write
f(2) = 2^2 - 2k - 3 = 9
4 - 2k - 3 = 9
-2k = 8
k = -4